The designers explain:
Nest chair brings together a hard base frame made of three oriented strand board cutouts and a soft pillow. It thus gives you a chance to sit comfy, vary your position and also to get up easily. The base is built by fitting parts together using nothing more than your hands. The black edging is a finish gained by laser-cutting the wood base, and it is a welcome visual detail, but also ensures that the edges don't wear with time.
For more information, visit ALLT.