1. Playing outside with his brothers.Just in case the answer was #3, implying significant effort from me, I figured I might as well enjoy another chapter of my book before dealing with the mess.
2. Playing alone in the basement - probably with the Lego creations his brothers usually won't let him touch.
3. Wreaking quiet havoc in unknown parts of the house.
I eventually found this in my bathroom.
Seriously, I think I could sell this to the Guggenheim. It's much more interesting than the pane of glass leaning against the wall or the rusty bedsprings on display the last time I was there.
*Menstrart - menstrual art