Sir #CharlesWheatstone concluded that the brain resolves the distance of objects using #BinocularVision & on the 21.06.1838 at the #RoyalSociety in London, he demonstrated an instrument he designed to prove his theory. The #Stereoscope was immensely popular in the 19th & early 20th CE, & was widely used for entertainment, in education & as an enthralling substitute to travel.