Illusionary Figure

Exploration Stage: Room of Fate
From: Martha
Description: The box in which my memories are stored cannot be found on the astral plane or in the real world. The Collector and I disassembled it into its constituent elements in order to give it greater protection. These elements appear as paradoxical mathematical objects, which you'll have to find. The box cannot be seen or touched, and yet it still exists. It has the properties of an impossible object. That's why the first element is an Escher Cube. Find it.
Completed: Congratulations, you found the Escher Cube! It cannot be created. It exists only as a drawing and represents nothing more than an illusion. Just like the box containing my lost memories...