Primitive Technology made durable, permanent and water-resistant clay bricks by firing them on a kiln. The hardened bricks can then be used to make a larger kiln, like a primitive self-replicating factory.
EverBlock’s interlocking plastic blocks are like giant size LEGO bricks, but are sturdy enough to create temporary or semi-permanent partitions, walls, and furniture. They’re also perfect for building playhouses for kids and pets. Play with their online 3D builder here.