I was disappointed when I saw the base was taken from a keyboard (I was expecting that to be mindstorm based as it was posted on HN). But the mechanism for the keys is very cool and well designed, it's a massive understatement to say it's just Lego pieces glued on the keys
The way you can easily slide them to perfectly arrange them is pretty neat too. I can see this work well in prototyping settings with DIY contact switches (two layers of aluminium with a piece of foam and a hole, basically).
