These new chairs by designer Noé Duchaufour-Lawrance disassemble for storage. No, this isn't the most efficient way to stow furniture away, but it's a neat idea.
Instead of folding up, the "Market" chair's curtain of slats rolls up like a blanket, leaving the frame bare so that it'll fit neatly together with another. If you want chairs that simply stack, you can stick to aluminum. [Dezeen]