This sturdy 15″ cube of corrugated cardboard is kitty’s dream come true! It’s great for perching on top or hiding inside. The inside opening measures 10″ x 10″ x 15″, perfect for napping or scratching on all four interior surfaces. The Kittyblocks can be stacked two high for more climbing possibilities (the manufacturer doesn’t recommend going any higher than that.) Once one side starts to show wear, flip it over for more scratching action. When it’s really finished, the whole thing can be…