Designed by students at Ludens, a Mexican design school, the shelf has about 4 layers, which reveal places to hang clothing, store coins, write notes or stash your keys. There are even fold out sections that reveal a mirror and cupholders. This is clearly still a concept, and while it seems neat, I could also see this thing getting chaotic if you tried to use it for too many things at once. [Ludens via The Design Blog via Craziest Gadgets]

Regardless of what countless lost games of Tetris may have taught you, these iconic shapes actually fit together very well. Their intrinsically flexible, modular design makes all sorts of sense to squeeze in an extra few cubbyholes or even, as Silvério and Filipov explore in the gallery below, the occasional drawer.

It's too bad these designs are just concepts, but you know the drill. Cry enough in the comments and maybe Target will realize that they can make a few bucks by licensing or just ripping off the design. [coroflot via walyou]

These plywood, floor-standing shelves are meant to be self-assembled, which makes us wonder: How can you reassemble your shelf to resemble your coffin if you're already dead? Ideal for psychics and vampires only, if you're mortal and boring, make sure your will specifically states that the shelf is to go with you—not for $5 at a garage sale. [Shelves for Life via Like Cool]

The starter set comes with two TwistTogether blocks, two shelves and a mini shelf, and will set you back about $110. (Retro robot toy not included, sadly.) From there it really depends on how much junk you have on your desk, and how much cash you're willing to drop to arrange it all in such a cool way. [Unplggd]

In other worlds, it's better to view the iShelf as an artistic statement about digital music or interface usability, or something, because that's pretty much what it is. It's still in concept limbo at the moment, but even if it doesn't ever see production the concept is good—it wouldn't be that hard to make your own iShelf with room for seven, nine, or—YES—eleven(ELEVEN!) albums. Or you could just not worry about it. [Yanko via Crave]

The Daywriter basically uses what looks like chalk to write messages during the day. Use this area to place your apartments bills along with a hastily scratched "I can't afford to pay all these myself, you know."

Meanwhile, the Nightwriter has an added glow-in-the-dark feature, making it a wonderful place for you to scribble "We can all hear you" for your roommate's offensively loud paramour to catch on his way to the shared bathroom. [Yanko Design]

Unfortunately, they are not for sale in the US or anywhere else. [Technabob]

If you don't mind that your wall might look like a miniature car just drove into it from the outside, these 20-inch-wide bookshelves might be just for you. They're 6 1/2 inches deep, just about right for smaller books, but we're not sure about how detailed they are. I mean, how perfect can they look for $69.95 each? [What On Earth]

Instructables' guide to building your own Tetris shelves costs you only about $85 in wood ($200+ if you buy good wood), plus some more in parts. You'll need equipment like table saws and wood glue, so if you don't have that you might have to find a buddy who does. Just be careful not to line them up horizontally or else you're going to have to start all over. – Jason Chen

Project Page [Instructables]

I guess those shelves can hold gadgets, too.–Brian Lam

Woodfold Bookcase Doors [via Uncrate]

The Liberty Shelf is part of Thermador's Freedom Collection of flush-mounted built-in-style refrigerators, and there are a lot more innovative features inside these fridges, too, such as halogen light towers, an electronic control panel similar to those in $5500 Sub-Zero refrigerators, and the Freedom Hinge that opens up to 115 degrees. All this coolness will cost you, though, between $3500 and $4300 depending on size and options. – Charlie White

Product Page [Thermador, via OhGizmo]

Tetris shelves have been around for a while, but Brave Space has now updated them for gamer-purists. Now in color instead of the original no-back design, these shelves can now match the rest of your furniture.

Also improved: the price—we hear it's gone down significantly. We dont' know by how much, but we're guessing "significantly" means it's much less than the $7k for 10 pieces they were asking for last year. Contact Brave Space for a quote.

Brave Space

Brand New Tetris Shelves! [Inhabitat]

Product Page [Thut.ch via SwissMiss]