DETAIL
Performer diplays 3 Dominoes, two of which show double five spots, and one a
double one spot.
The Dominoes are mixed, and the spectator asked to spot the double one Domino.
He fails to find it.
Then one Domino is elminated, but he fails to find the one spot again.
Finally the second five spot is eliminated but spectator still cannot find the
one spot!
Easy to do!