Loyola

Stamps

Cole wanted to show me some of the stamps he's inherited (via my Dad) from his great grandfather (Earl Nicholas's) stamp collection.

I went to get my camera when we kept running into interesting ones.

slideshow

The ultimate puzzle

I've thought about selling a puzzle like this that would only have a solution if (say) there were twin primes with more than 100000 digits.
You'd sell boxes of puzzle pieces asking for the associated tiling, placing no restriction on its size.

I think this is possible, mathematically, at least, or at least I remember reading about it long ago (someone named Berger, or maybe Wang. Or maybe it's in the Gruenbaum and Shephard book).

They'd be welcome to buy more pieces in sets of 100, say. The cognoscenti would know that a solution almost certainly exists, but that it would involve trillions of pieces.

Just keep selling those boxes!

This site describes how to buy this puzzle, and a contest (somewhat vaguely).