Call it a massive attack of fruits and veg.
Simple circuits have long been able to make use of sensors in real-world stuff like apples or JELL-O. But Make Makey deserves special credit for making interfacing those circuits with a computer silly-simple. The original dream behind many computers was extending the interface between your mind and the world. With something like Makey Makey, including physical objects in what you imagine is made easier. And it’s especially gratifying – and telling – that the interface that’s most popular is often a musical one.