Ghost Whisperer Crystal Ball
Go play with the crystal ball and see if you can find the trick before you read any further...
Are you sure you want to know? It’s going to spoil the illusion…
… and illusions are fun!
The Spoiler:
If you add together any two digit number and subtract the results from the original number, you will always get a multiple of nine that is 81 or less. Always. Notice that 81, 72, 63, 54, 45, 36, 27, 18, and 9 are always the same symbol.
Cool stuff, eh?
On the down side, the game isn’t fun anymore after you find the trick. Such is the way with a variety of illusions. Oh well. I’d still rather have math than illusions.