The balls are not visible, but we can shoot laser beams into the box at different entry points and observe if the laser beams leave the box, and if they do, where they come out. The laser beams interact with the balls in various ways.
Bolak ez daude ikusgai, baina laser izpiak jaurti daitezke koadroaren barrura sarrerako puntu desberdinetan eta laserren izpiek koadrotik irtetzen badirazein lekutik irtetzen diren ikusteko. Laserren izpiek bolekin modu desberdinetan elkarreragiten dute.