This thing is friggin cool. Its composed of Tetris shaped wooden sliders that ,when an object is push in to them, creates a form around the object. So you can literally throw anything anywhere(and any which way) on the shelf and it will stay. Only down side is that you need like a foot and a half (or one fat thigh) of clearance space behind the unit for the displaced wood(heheheh) to go. So it’s not exactly gonna snug up like normal bookshelves and other various furnishings. You know what id like to try to stuff in there? Wrong! Get your head out of the gutter, the answer was my cat.