I took a photo of the shower nozzle in case you hadn't seen one. the motor is in the nozzle, so the water pressure makes it turn and causes it to turn on and heat up the water. if you turn it on too much the water goes too fast and it's not warm enough, if you go too slow it will stop turning, so you learn to get it just right so that it's working and heating up but not too fast that it's too cold. When I first saw the Mcdonald's place I thought it was a ripoff place called "Imposters" but then my friend explained it said postres, so it was really Mcdonald's desserts. ha ! the classroom picture shows my old classroom.