A childhood belief about bathrooms

When I first started going to pre-school everything was very strange and new. The bathroom had one of those sinks that is basically a big tub with streams that fan out in a semi-circle. You would turn it on by stepping on a bar that was on the floor. I had never experienced this type of sink before. The teacher would tell us to go wash our hands before our snack. All the kids would run in and crowd around this sink. There would always be kids there before me to press on the bar. So I never understood how the sink turned on. I didn't see any handles or knobs. I thought of lots of differant solutions. Maybe the bathroom had a motion camera like the doors at the super market. I also thought that maybe the teacher would press a button that would turn the sink on and off. It wasn't until i started grade school when there wasn't kids always crowded around it that i discovered the bar on the floor.