This is a piece of A3 paper that had been folded in a particular pattern. I made up the design on the spot a few years back. Funnily enough, i found out that i could fold it into a really small square much to my friends surprise.
Prefolding: 25 mins
Folding: 45 mins
Funnily enough, i put my journal on top of the paper to test out its structural integrity against something that weighs about 1kg... it worked alright