haha i make a little joke!! but at that altitude you could probably hold something flat against the horizon an see a bit of curve,( works looking at the horizon at sea when its a clear day)
Hahaha, Nice one! I'll try to take a picture with a better camera.. About holding something flat against it, u're totally right!! It's awesome how I didn't notice that I'm on the ledge of a volcano and I can see 3 major volcanoes: Volcan Antisana (5750m/18800ft), Volcan Cotopaxi (5900m/19300ft) and Volcan Chimborazo (6310m/20700ft).