Deep Mirror

Takes you through a Through-Mirror: you step out of its pair, within one world. Right-click a paired mirror and stay close for a moment. A full one holds three steps (Charging Basin); a step leaves a Ripple unless you are under the Hush. Sneak and right-click a mirror to send items into it, like a Pocket Mirror; sneak and right-click an Ender Chest, and it opens your Ender Chest from anywhere.