To determine the accuracy of each image, researchers used an 8-by-8 matrix of the stride of a horse walking left to right. In a given cell, the forefeet attitudes belonging to the cell's row are paired with the hind feet postures belonging to the cell's column. The gray squares indicate the correct depictions. The study author often used mirror images of photos so each animal walks from left to right.
A. Prehistoric: A bull from the Lascaux caves in France fits into cell Bb of the matrix and is therefore correct. B. Pre-MuyBridge: A horse drawn by Leonardo da Vinci fits into cell eH of the walking matrix and is therefore incorrect. C. Post-Muybridge: A Hungarian cavalry statue fits into cell Ba of the walking matrix and is therefore correct.
Clockwise from top: Courtesy Gábor Horváth; Gábor Horváth; Keenpress/National Geographic Creative