Art and design galleries are the secret weapon of the best holiday gift givers. Module R's use of functional, customizable forms makes it extraordinarily fun by giving gift recipients something to play with and move around as they please. Sometimes the concepts are as simple as Black + Blum's Time Square ($78) clock with a face that's both magnet board and blackboard surface so the user can scrawl notes on it or stick things to it as they please. Others such as Dagan Design's Puzzle Wine Rack ($69) require a bit more of a decorator's eye to make the pieces fit in their space. Many of their offerings tend to be big-picture home items such as modular stair runners ($160 to $350) and hanging sculpture such as Donald Rattner's books-and-boxes installation Jenny Holzer Has Nothing On Me ($6,500), but smaller items including the Lego-style BrickCase sleeve for Apple's iPhone ($20), Ball of Whacks magnetic equilateral quadratic puzzle ($35) and LED-style digital-font magnets ($16) are a bit easier to stuff in a stocking.