Behavioral studies have determined that the house cat in comparison to man, has 6 to 10 times our sensibility at night. This occurs because when the pupil is at maximum dilation the relationship between the diameter and eye focal power is greater for the cat. Besides this, the retina of the cat is adjacent to a reflecting retinal layer, known as the tapetum lucidum. This retinal layer increases the ability of the cat's eye to see in dim light and also causes the characteristic shining of the eyes as seen in the dark by an observer. In this type of art, the geometrical forms appear to be moving due to multiple ocular effects that produces vibrations, oscillations, and pulsation of the lines.
Chromatic effects are notable.
Professor Joseph Rizzo, an italo-american at Harvard Medical School, in Boston, recently demonstrated a functional retinal prosthesis in lab animals. This technology will probably aid those people who suffer from hereditary or degenerative retinal lesions. Ancient people when looking closely into the eyes of another person, would notice a small figure in the middle of the eye.