Clever Loco – Pack of 4 cards

This is a pack of four blank Clever Loco cards and envelopes wrapped individually. The photo was taken in a train graveyard outside the town of Uyuni in Bolivia located high up in the Andes. On this rusting carcass of a steam locomotive some distance from the town, we discovered that someone had painted an Einstein equation. It must have taken a lot of paint and it was well over a kilometre from the town itself.