set up a webcam for Lil Miss to make vids of her playing. (because otherwise she borrows our cell phones and runs them down)
She took down the camera and pointed it at athe screen and discovered the fun endless window effect.

Lil Miss: MOM! Look at this! WOW!
Me: yeah.. pretty neat huh?
Lil Miss: How is that happening? What is it?
Me: You’re pointing the camera at itself so you see a picture of a picture of a picture
Lil Miss: wooooow
Me: welcome to infintiy