Newton disc

[1] The concept that human visual perception cannot distinguish details of high-speed movements is popularly known as persistence of vision.

He referred to the mixture of colors painted on a spinning top as "dirty" and described several experiments supporting his theory.

This also happens in the case of shooting stars, whose light seems distended on account of their speed of motion, all according to the amount of perceptible distance it passes along with the sensible impression that arises in the visual faculty.

al-Haytam also noted that the top appeared motionless when spun extremely quickly "for none of its points remains fixed in the same spot for any perceptible time".

[6] After Ibn al-Haytham, Fakhr al-Din al-Razi (d. 1209) performed the spinning disk experiment, and like his predecessors, he concluded that it showed an optical illusion.

He thus found the seven primary colors red, orange, yellow, green, blue, "a violet-purple" and indigo.

[8] In reaction to Robert Hooke's criticism of the new theory of light, Newton published a letter in the Philosophical Transactions, with other experiments that proved how sunlight existed of rays with differentcolorss.