When they're still young, children tend to see the world without preconceptions,  which can give them a unique perspective. And sometimes they see things that adults should be glad that they can't...
Haven't you seen one before, Sensei?
ألم تري واحداً من قبل يا سينسي؟
Haben Sie denn noch
nie einen gesehen?
Non li hai mai visti, maestra?
Você nunca viu antes, fessora?
Вы никогда его не видели?