When you have something you want to make with paper, you cut/fold paper to make the shape.
I wish however, there were paper and ink that do the ‘folding’ and ‘cutting’ automatically. You send the data of the shape you want to make from your computer/mobile to the printer. The paper you printed out automatically starts to cut and fold itself!
If that really happens, you’d be able to make various complicated paper models with no efforts. It’d be even cool if you could download 3D data from a gallery like Google 3D Warehouse, print it out and you get it in your hand. You download a physical thing!
And the shape-shifting concepts like the below one wouldn’t need any complicated mechanisms if such paper technology were available.