These are Milli Chairs, a novel design by Duffy London. They're made to resemble millipedes. They don't move (although that would be a nice feature), but they look like they're ready to crawl right over you!
They're easy to adjust. The back becomes the bottom and vise versa by flipping them over. I suggest collecting and arranging a bunch of them. If you get 54 Milli Chairs, you can simulate the Illacme plenipes, a millipede with 750 legs.