Instead of a shelf or frame, these cubes provide such a subtle look and modern design impact, and conveniently hold whatever you wish to see. I purchased three cubes to display shells, etc., from various travels. The cubes blend seamlessly into the wall they're installed onto which happens to face my bed--a calm view of tranquil, floating shells; no black frames or wood shelves here!
I would recommend drilling these into a stud and using a metal anchor instead of the provided hardware. Also, a level. That was my main problem, getting them even, however, could've been merely user/installer error!
Love them!