juggling probably is the math/computer side of the brain...I think if we poled people who enjoy ambigrams, we would find that the majority aren't jugglers--but computer science or mathematically minded people.  At juggling conventions, you will meet more math and computer people than any other profession.  I am a juggler and do know several other jugglers that enjoy ambigrams... I'm guessing that if we held an ambigram convention you would find the same thing.