Microsoft might not be ready to talk about Windows Phone updates at Build, but that hasn't stopped the company from showing off a wall of 200 phones running its mobile operating system. The display was built by Windows Phone developer Rudy Huyn, and it contains 200 Lumia 825 developer devices that can be controlled remotely. Huyn helped build an app that powers the interactive display that demonstrates the Windows Phone interface and Nokia Maps. All the devices simply sit mounted on the wall waiting for a signal from a custom Windows Phone app. We've seen similar efforts on other devices before, but this impressive display is the first time you'll see 200 Lumias in such close proximity.