I was playing with cards, as I often do, when Zach walked up.
“Can you do a trick for me?”
“Sure,” I said. I like doing them.
As part of the trick, I asked Zach to pick a card, any card, and remember it. After he did, I collected a bunch of piles of cards, his card included in the piles, and then placed each card face up in columns.
“Now,” I said, “which line is your card in?”
He looked for a few seconds.
I watched for a few seconds more. “Do you see your card?”
He nodded.
“Well, which line is it in?”
He looked at me again. “Well, it’s kind of in two piles. There’s a five here… and a five here…”
