after not too long i have to just focus on this thing and do it if i want to succeed. that was the hardest part, just to try to run a family and scrape whatever i can to make this bicycle. this is the rare part which started like this, and then we doubled and glued it and that becomes the frame. >> nobody knows how to calculate the strengths of cardboard. one of the first things was to try to calculate and see if we get the properties out of it, and that's what i did. the origami is a way that gives you -- it is like you fold it, you get stronger and you fold it again and you have six times and so it goes and goes and goes. and that's what i do basically, just fold it and fold it and get to where i want. it was a big issue to try to come up with something heavyweight cardboard, took a very long time and i get to the