Saw the Lore Podcast and this stuck with me.
Wondrous item, very rare
This cloudy glass orb is a size of a head. When placed on up to five feat of ground, 1 food to stone, or 1 inch of metal, the glass becomes instantly clear and you see through it into through the material. Then, you focus on an object in the room and summon it to you. It move at a rate of 1 foot per round floating to you. While you are silent, making no noise, it continues to float to you and will float through the wall. The moment you make a noise the object falls and the earthglass goes back to cloudy. You can use this item once per day.