- Gambling (poker, blackjack, roulette, etc)
- projection-guided manipulation (eg: picking bad apples out of a stream)
- assembling things
- sharing applications
- finger-length based biometrics, user identification
A number of jigsaw puzzle pieces are scattered on the table, face up
as I put my finger on any puzzle piece, all the other ones which
can snap with the chosen piece are illuminated.