We’ve all had the experience of being trapped in an automated telephone menu system, cursing and pressing buttons at random in a desperate attempt to get someone to talk to you.
Which way is this dancer spinning: clockwise or anti-clockwise? Your answer supposedly indicates how your brain works.
I read the Foundation Trilogy for the first time in the early 1970s, just as the first pocket calculators were appearing in stores. They looked exactly like what Asimov described.