Next time youre passing by a cliff and happen to see a precariously hanging tent with campers inside, dont be alarmed, its just a portable ledge (portaledge):



Portaledges ” or deployable hanging tents ” might seem like a thrill-seeking activity (and it can be), but the idea has actually been around since the 1950s. During this time, rock climbers began to stay overnight on the mountains they were scaling and started looking for convenient niches in the mountain side to make their bed.