Board Thread:General Discussion/@comment-3123266-20140303175822/@comment-2090489-20140707164721

Agent I guess you read my earlier posts about this. I had a theory that the Orb and Tesseract are just containers for the actual stone inside, and if you look closely at the cube you can see the outline of a stone within it. I think that with the exception of the Aether that is a liquid as said in Thor 2, that the purist form of the stone looks like the blue gem on the scepter. So because of the stones great power, people made containments for them. Mind Stone->put in scepter, Space Stone->put in cube, Power Stone->put in orb, and Aether was put in a rectangle container by the Sif and the Warriors 3.