These two men, corresponding, quickly realized how many everyday actions had secrets to reveal, once technology let them see faster than could the naked eye. Their zo÷praxiscope and chronophotographie revealed a whole formerly unseen world: the serial grace of a woman carrying a bucket up steps or pouring water over her head, or letting her handkerchief flutter to earth; a shadow boxer; a nude blacksmith striking his anvil; a nude woman stepping up to a bed, drawing back the sheet, and climbing in-lifting her knee, bending sideways, sliding down under the covers, all this arrested in a few discrete frames; a child rising from the ground; a man changing a bayonet, pounding a mallet, opening an umbrella; acrobats, baseball players, high jumpers, fencers, lumbering elephants, dancers with lacy air-blown clothes or none at all. How little we knew! These days, when television cameras routinely display the spin of a four-seam fast ball, we take our temporal erudition for granted.