"Daddy, I made you a Venn diagram."
That's weird. Sounds like she said "Venn diagram," of all things.
"A what, Honey?"
"A Venn diagram. It's matzah and challah."
And indeed it is:
The exclusive Matzah section (left "circle") is passover, obviously. The shared area is "all other nights." I don't know what the exclusive Challah section (right), unless it's just our default mode. She can't quite explain it.
Cross-posted at Kerckhoff Coffeehouse