It sounds like the 'prism-goggles' from the article's experiment control for the effect of just looking at it upside down. Clearly what's needed is to hang some

It sounds like the 'prism-goggles' from the article's experiment control for the effect of just looking at it upside down. Clearly what's needed is to hang some students by their feet and send some others to space to see if it's the inner-ear effects or the posture that changes your perception :P