Board Thread:General Discussion/@comment-3123266-20140303175822/@comment-2090489-20140426013824

Well in Thor 2 Odin said that the "other relics" take the form of stones, but that the either is fluent. So If they stated in Thor 2 that the purist form of the object is a stone, and it is confirmed that the Orb and Tesseract are indeed infinity stones, then the cube and orb must be a shell to the stone. Maybe all the infinity stones are so powerful and are fluent like the Aether and the ancients and/or immortals built shells to contain it's power so that it can be weilded, which is what Sif and Volstag did to the Aether at the end of Thor 2 when they gave it to the Collector in a rectangle container, and why the mind stone is on a scepter, so that it can be used to control peoples minds.