An idea

This idea came to me when I woke from my afternoon siesta, I don’t know from where; it’s something like that coiling snakes inspiration for the helical model of DNA… or almost. ;)
Anyway my idea was this, why don’t we make “self locking bricks”, that has a groove on one side and an elevation on the other, so that the elevated part of brick fits into the groove of the next. This way less cement will be used and houses should come cheaper, no? ;)