Every so often, things cross my computer screen that remind me of how fascinated I continue to be with spatial thinking. It started with my friend’s Facebook sharing of how needlework helped her with calculus, just like this article says. Next thing you know, I’ve tumbled down the Internet rabbit hole and learned that castle staircase designs were not random, nor were other elements of medieval defense. Maybe it’s not as obvious now that we’re all driving motorized vehicles but road-side-driving-preference also has historical rationales. What do these all have in common? Spatial thinking, of course.