Last month, when I was in Mexico I picked up these geography-themed loteria sets at a 25 Peso store. I was trying to think of way to use them in some mail art — then I saw this story about how the Mayans invented a rare shade of blue. That got me started, it was going to have to be about blue. A series of pyramids were painted on the backs of the loteria cards. Too delicate for postcards, they ended up in envelopes. This series is being mailed out this afternoon.