Later he went upstairs to clean his bathroom on his own and I found him in there, flushing the toilet and messing with the float, watching the water drain and fill up, the levers go up and down, etc. He was so intently focused on it until he had "figured it all out" I guess. It's funny how interesting and educational the simple things in life can be to little kids.
"Thou shalt also make a laver of brass, and his foot also of brass, to wash withal..."
Hunter is 4 years, 6 months old