Camera of Holding
You find a box in the attic.
This box contains a digital camera. There are no logos or manufacturer’s insignia on the unit. The camera has two buttons where the shutter button should be; they are labeled STORE and RESTORE.
If the camera is turned on and the STORE button is pressed, then whatever object is focused at the center of the camera display will disappear. If that picture is redisplayed on the screen and the RESTORE is pressed, then the previously disappeared object will reappear.
The camera is otherwise normal.