I'm not sure what's most impressive here. The mere fact this looks like a working keyboard, the fact it works like a real keyboard, or that instead of a "Home" button it's got a little house that you press.
Builder Jason Allemann's keyboard is built entirely using existing LEGO pieces, which means that while most of the letter keys are playing it straight, most of the special function keys are hilariously adlib. "Caps" lock is the best.
Functioning Lego keyboard [Brothers Brick]