Originally Posted by Minnewaska
No ingenuity required for the jack in the box, just the ability to translate mass and gravity into a mathematical equation. That's a problem set. The light switch question was a riddle.
A man is standing before a portrait painting on the wall, points to the portrait and says to the person standing next to him, "Though brothers I have none, that man's father is my father's son."
Who is the person in the portrait?