We love our built-in bookcases. But as our collections grow, so does our need for more storage space. Now a local design firm has fulfilled our heart's desire with a new line of endlessly expandable, customizable shelves.

We've admired Mash Studios' woodwork in some of our favorite Malibu stores, such as 9026 Eyes and 7 for All Mankind. And its high-end residential furniture wows us, too, especially the PCH series, teak with aluminum cast to look like wood, balanced atop metal support blades ($800 to $4,400).

Now there's the new Mod series, a modular system with a clean, Scandinavian look. Each stacking cubby is solidly made of powder-coated steel uprights and pine horizontals. Measurements are 24 inches wide by 15.5 inches deep, with optional doors, drawers or a drop-down desktop. They're so sturdy, you can even use them as end tables or place them end-to-end as benches.

Red and blue-gray options echo classic Eames storage units, and a charming striped nubby upholstery handwoven in Tibet evokes Mexican blankets. Pieces begin at $300--an überbargain considering there's little risk we won't always find uses for them. It's a lot of storage for a little commitment.

Mash Studios, 12705 Venice Blvd.; 310-313-4700 or mashstudios.com

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