A dishwasher is the most mysterious domestic appliance. You shut the door, turn it on, hear the sounds of sloshing water, and the dishes appear clean. I had assumed that it was something like a clothes washing machine in that it filled the container with water and then churned it around. But I noticed that our new dishwasher seemed to go into the sloshing sound mode pretty quickly, long before there would be time to fill the volume. So I was glad to come across this video where someone had placed a camera inside the dishwasher to reveal its secrets.
My dishwasher does not seem to have the central spout. Instead it has a blade at the bottom with holes in it and I suspect that it achieves the same result by the blade spinning in the horizontal plane while squirting water upwards.
One consequence of this new knowledge is that my fear of accidentally opening the door and flooding the kitchen is gone. It looks like the water would shut off immediately with only a slight splashing.