Paper is real, so it is uninhibited by the limitations imposed by the imagination of the programer.<p>For note taking, with a pen I cam easily transcribe math formulas. I cant do that with a txt editor.<p>Ok, so I switch to org-mode and become a tex mode guru. There's still no easy way to make a geometric drawing.<p>So now I have a tablet. The stylus feels weird, the tablet heavy. The resolution much lower than paper, the GUI, the battery life abysmal compared to paper, the latency anodyne.<p>But sure, it does everything paper can do.<p>... that is until I crease the paper to make a geometric figure freed from the limitations of compass and straight edge constructions, a cube [1], a crane to flirt with my neighbor, a bottle opener [2], a makeshift knife [3] or to use as kindling.<p>[1] I've actually done this to help me visualize crystal structure's interstitials.<p>[2] Neat trick a frenchman taught me.<p>[3] really sucks at this, but I did slice an apple with a sheet of printer paper once