On this interpretation, the plasticity revealed by ORDs is primarily proprioceptive and kinaesthetic, rather than visual. Stratton’s world came to look “right side up” (1897b: 469) after adaptation to the inverted retinal image because things were felt where they were visually perceived to be—not because, his “entire visual field flipped over” (Kuhn 2012 [1962]: 112). This is clear from the absence of a visual negative aftereffect when Stratton finally removed his inverting lenses at the end of his eight-day experiment: 