Here’s a Japanese documentary about the life of Gunpei Yokoi. Has a brief section about the VB starting at ~7:15:
http://www.youtube.com/watch?v=DuFBQ9VKoAE

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I have seen this video a year ago…

At the starting of the video Yokoi is watching the two children playing their Gameboys… why can’t the same done for those who are playing their Virtual Boy? It would make sense, he can hide even better while someones head is in a VB!

I have too active of an imagination! 😛