Why you must have it: The cold glow of an LCD monitor doesn't exactly give you the mental health benefits of real windows, something that most geeks only experience in their cars. After all, datacenters, development labs, and basement workshops -- where many techies spend hours -- rarely have windows. That's where Sky Factory's SkyV comes in: You put one of these custom light boxes in your ceiling, and they adjust the scenes automatically for time of day and season, simulating the outside world, no matter where you are. The SkyV uses a high-definition display and can show a variety of scenes. (The less expensive Programmable Sky Ceiling uses a static image, with only lighting changes to simulate times of day and seasonality.) Test Center contributing editor Logan Harbaugh calls them "the ultimate gift for a cubicle-dwelling geek."