The number Four is not a special number in the row of numbers, but for us human beings it appears to have a special influence. We are intended to believe the fact that this number has played a dominant role in the categorization of the world around us. We are receiving the image from the world through the electromagnetic waves in the visible light spectrum hitting our receptors at the back of our eyes. We are actively constructing an image of the world in our brain. We transform the electromagnetic waves by a very complex chemical process to signals transmitted along million of nerve cells to various parts of the brain. The total visual field is transected in Four quadrants and these quadrants are processed separately in the brain. In higher parts of the brain the images are combined and give us the impression as all parts of the visual field were processed in narrow relation to each other. I personally think, that this partition in Four parts of our visual field influencing us far more than we think. Not only our visual field is divided in Four, as the list will show in more things Four plays a dominant role.

Four dimensions were created at the beginning of our universe: time and three-dimensional space.
Four 'fundamental' forces in nature (gravity, weak interactions, strong nuclear forces and electromagnetic forces were acting on this matter).
Four geological periods: primary, secondary, tertiary, quaternary
Four of the most important for the building of our body (99.4%) are Hydrogen, Carbon, Nitrogen, and Oxygen. (Carbon is unique in chemistry because it forms a vast number of compounds larger than the sum total of all other elements combined. By far the largest group is that composed of carbon and hydrogen).
Four elements form Four molecules Water (H2O) Carbon dioxide (CO2), Ammonia (NH3) and ethane (CH4),
Four elements form Four simple combinations of atoms: methyl (-CH3), hydroxyl (-OH), carboxyl (-COOH) amino (-NH2),
Four major families of small organic molecules: the simple sugars, the fatty acids, the amino acids and the nucleotides. Amino acids are the subunits of in the synthesis of proteins .
Four families of the 20 amino-acids: The common acids are grouped according to whether their side chains are acidic (2), basic (3), uncharged polar (5) and nonpolar (10). The rule by which the nucleotide sequence of a gene is translated into the amino acid sequence of a protein is the so-called genetic code.
Four hydrogen atoms attached to one atom of carbon, with tetrahedron symmetry). Our genetic material consists of DNA and RNA.
Four bases for DNA: Cytosine(C), Guanidine (G), Thymine (T) and Adenine (A)
Four bases for RNA: Cytosine (C), Guanidine (G), Uracil (U) and Adenine (A),
Four different nucleotides forms the RNA. Sets of three nucleotides (codons) in a mRNA molecule are translated into amino acids in the course of protein synthesis.
Four tetrads clusters of the prokaryotic cells
Four seasons of the year: spring, summer, fall and winter
Four (quarter) parts of a year (every three months)
Four quarters of the moon
Four weeks of a lunar month

Four periods in our lifetime: child, youth, adult, and old age
Four phases of fertilization. First it stimulates the egg the complete second meiotic division. Second it restores the normal diploid number of 46 chromosomes. Third the possible sex of the future is determined by the chromosomal complement of the spermatozoon (2 X the embryo maybe a genetic female and X and Y chromosome a possible male). The mingling material of maternal and paternal chromosomes the zygote is a genetically unique product of chromosomal reassortment, which is important for the viability of any species. The Fourth phase: the process of fertilization causes a metabolic activation of the egg.
Four phases of mitosis: S phase during which period the DNA synthesis takes place, the DNA of each chromosome is replicated. Before and after this phase G1 and G2 intensive metabolic activity cell growth and cell differentiation occur. By the end of phase G2 the volume of the cell has roughly doubled, the DNA is replicated. Now we enter the phase of mitosis (M). Continuously diving cells then repeat this cycle of Four phases (G1, S, G2, and M). Following mitosis (five phases) two daughter cells are produced.
Four segments of the embryo. The organization of the body plan of the embryo of a human being depends on two separate patterning mechanisms one defining the dorsal and ventral side and the other the head and tail of the embryo. This is under genetic control (in total about 70 genes). The embryo is so divided by two axes in Four segments.
Fourth week of pregnancy the embryo, which is still about only about 4 mm long, has established the rudiments of most of the major organ systems. In the fifth week we see the development of Four pharyngeal pouches and arches resemble the Four gills of fishes. Are formed in the fifth week: Four grooves in the primitive limb have formed our hands and feet.
Four segments of the retina: nasal, temporal and lower and upper. The information of these quadrants is projected to Four different areas in the visual field of the thalamus and the cortex, Four different visual receptors, one for black and white (rods) and three kinds of receptors (cones) to various wavelengths of light, Four component qualities can produce all tastes: sweet, sour, bitter and salty, Four mechanoreceptors of our glabrous skin and hairy skin. Four types of skin.
Four major proteins form the muscles: myosin, actin, tropomyosin nd troponin.
Four major structures of the brain: forebrain, mid brain, hindbrain and spinal cord
Four lobes of the cortex: frontal lobe, parietal lobe, temporal lobe and occipital lobe.
Four regions of the cortex who are receiving all sensory signals: visual cortex, auditory cortex, olfactory cortex, and sensory cortex.
Four segments of the brain: left and right brain and upper and lower (cortical and subcortical) structures.
Four phases of sleep interrupted by the rapid eye movement sleep.
Four chambers of the hart(Two chambers for receiving blood and two to expulse the blood)
Four heart valves .
Four extremities: two legs and two arms.
Four relay stations of the nerves of the auditory system: cochlear nucleus complex the superior olive, the inferior colliculles and the medial geniculate body before arriving at the final destination the auditory cortex
Four pain systems lateral and medial system on two sides
Four visual constancies: size, space, color, and movement
Four factors for inventory for measurements of handedness, footness, eyedness and eardness.
Four phases of the evolution of our brain: reptiles, no emotion only to instincts to eat no relation of time, paleomammals subcortical systems, thalamus, anger and fear first emotions, neomammals: neocortex, development of language and speaking
Four phases in the development of consciousness
Four types of memory: registration, retention, recall and emotional
Four classifications of neurons in: dendrites, connections axon length and neurotransmitters
Four gustatory nerves
Four major descending spinal tracts ( originating from motor cortex, red nucleus, reticular nuclei and superior collicules nuclei)
Four main neurtransmitters: norephephrine, serotonine, dopamine and acetylchlorine
Four ventricles of the brain (Fluid filled caverns and canals inside the brain)
Four parts of the spinal cord: 2 dorsal and two ventral horns
Four ions on either side of the neuronal membrane: Na, K,Ca and Cl
Four domains of the peptide clump together to form the pore of the voltage -gated sodium channel
Four fold aim for improving head, hart, hands and health
Four fluids in the human body: blood, slime, yellow gall, and black gall (Galenus 130-230)
Four F's : feeding, flying, feeding and f…..

Four notes in two groups in the scale in music: tetrachords
Four voices: soprano, alto, baritone and bass
Four string instruments for the symphony orchestra: violin, viola, cello, double bass
Four strings of violin, viola, cello, double-bass

Four walls of a Castle or cloister,
Four duograms of I Tjing: old yang (summer), young yin (autumn), and old yin (winter)
Four gospel writers: St Matthew, St Mark, St Luke and St John
Four middle ages church tones: protus, deuterus, tritus and tetrardus
Four church fathers: Ambrosias, Augustinus, Hieronymus, and Gregorius
Four noble truths: the basic doctrines of Buddhism specifying that all life is subject to suffering, that the desire to live is the cause to or repeated existences, that only the annihilation of desire can give release and that the way of escape is the elimination of selfishness by means of the Eight-fold path.
Four questions concerning the meaning of Sedar customs asked usu. By the youngest participant at the beginning of Passover Seder service prompting recital of Haggada
Four principles of Hindoism

Four corners of the land of the Hopi Indians called the Black Mesa
Four elements of nature (Ancient Greek culture) Air, Earth, Water and Fire
Four elements of the Ninja: earth, water, fire and wind
Four virtues of the ancient Greek: wisdom, courage, prudence and justice
Four different psychological characters: choleric, sanguine, melancholic, phlegmatic.
Four (th) estate: a group other than the clergy, nobility or commons that wields political power
Four penitential days in a year in Roman times
Four quarters of an academic year, approximately 12 weeks each
Four (th) power (civil service), the other three: the legislature, the judicature, and the executive.
Four benches in court (middle ages) on where seated the bailiff (sheriff), the magistrates, the accuser and the accused
Four Roman emperors: Galba, Otho, Vitellius, Vespasianus;
Four corners of political, social, cultural and religious horizons
Four basis human freedoms: freedom of speech and expression, freedom of worship, freedom of want and freedom of fear (F.D.Roosevelt)
Four horseman: war, famine, pestilence and death personified as the Four major plaques of mankind.
Four threatening forces of any kind (scarcities, subsidies, doles and inflation)
Four–leaf clover-bringing luck
Four eyes private talk
Four letter word
Four years period for elections
Four year period for leap-year

Four faces of a pyramid
Four lines form a rectangle
Four loops in computer network
Four colors print (black, red, yellow, and blue)
Four wheels of a motorcar
Four ends of the cross
Four wings of a mill
Four burners of a cooking apparatus
Four stroke engine
Four poles of a telephone plug
Four folds in a A4 papers
Four-bar linkage: a basis linkage mechanism used in machinery and mechanical equipment
Four stars of a general or admiral, stripes of a captain of ship, airplane
Four directions of our compass: North, East, South, and West
Four corners of the Mediterranean Sea. Considered as a rectangle by the Phoenician people. The measured the sea in length and latitude. Therefore we still measure a place on the global earth by length and latitude
Four corners of the earth
Four color cards for the Wisconsin Card Sorting task, red, green, yellow and blue.
Four quarters of the Logo of Windows
Four stroke cycle of a suction of explosive mixture, compressed ignited burns and performs useful work on an expansion stroke and expels the product of combustion on an exhaust and performs word and expels the product of combustion

Four years period for Olympic games
Four hundred meters distance of the athletic track
Four -ball and Four-some in match of golf
Four days in golf competition.
Four strokes is the par in golf
Four sides in card games

Quart (er), Quart, Quater, Quatrain, Quatrefoil, Quarto, Quartermaster, Quartet, Quadrature of a circle

Is this just coincidental or is it our conditioned mind that we come up always with Four. I don't know the answer. I want to show the remarkable role Four plays in our life. If we look at constructions made by humans like rooms, windows, building, we will see rectangular forms. Quite in contrast with forms in nature like trees with irregular forms. We should realize that the other numbers like 0 and 1 are also of great importance (digital language) and the number 2 as a building block of the number Four (2x2). It would be of great interest to make also a list of the other numbers to whether they show important relations as we have shown with the number Four. The only reason why we are looking for these relations is the fact that apparently complicated features, like a human body is build of relatively simple elements.Maybe that we unconsciously conceive the world around us according our basic structural elements? Through all ages we came up with these same basic elements.Anyhow there is more that we don’t understand than what we know anyhow.
Readers are requested to comment on this note, either they put it aside as wishful thinking or just pure fantasy.