They are easier to keep amused. Because they are easier to find in the dark. So they know if it is morning or afternoon. So that when they're on the train they can tell if they're going to work or coming home. Because they forgot to take the tissues out of the box.
Tits go in front.
So they know what day of the week it is. Because that's where you're supposed to wash vegetables. So you don't have to retrain them on Monday. Because they can understand them. The oven doesn't go to 700 degrees.