Aside from a few innovations in materials, axe design has been something that's gone relatively unchanged for awhile now. But a new concept, dubbed the Zai Core, from designer Kacper Hamilton, which makes use of carbon fiber in the handle and a series of interchangable carbon steel blades, breathes new life into an old object.
How well this specific implementation would actually work in the real world is open to debate. But the general ideas—materials, function, etc.—are wonderfully clever. Would you trust this thing to chop your firewood? [Dezeen]