Even if you’re not Irish, and the most Irish thing you’ve ever done is eat Lucky Charms, you know all about leprechauns. The thing everyone knows about leprechauns is they love gold. The thing everyone knows about gold is that in Irish tradition pots of it languish at the “end of the rainbow.” At the end of every rainbow, guarded by a leprechaun, is a legendary “pot of gold.”

Sounds like easy pickings, no? Except for one teeny, tiny flaw in that equation no one can ever FIND the end of a rainbow. Ever try to follow a rainbow from one end to the other? The “end” always “moves,” shifting onward, westward, eastward, somewhere. No one ever finds leprechaun gold, because no one can ever find the end of the rainbow.

Rainbow ends are “movable eats.” As you come closer and closer to what looks l…