Gordon Hall performing “AND PER SE AND—A Lecture in 23 Tufts” (2016) (all photos by Stephanie Lynn Rogers unless otherwise noted) (click to enlarge) PHILADELPHIA — The “I”-shaped table is set up as if ...

This article was originally published in The Conversation. What do puzzles, gymnastics, writing and using maps all have in common? They all rely on people’s ability to visualize objects as they spin, ...