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This just came up at the grad student Tuesday Tea, and I'm loving the question. Suppose you lost an eye. What kinds of customized fake eyes would you get made to take its place? Myself, I think I'd have an entire briefcase of them. Row upon row, all nestled securely into foam padding cutouts. USB drives, laser pointers, flashlights, creepy glowing ones, digital cameras... the range of possibilities would almost make up for the loss of stereo vision. The only problem is the lack of easy muscle control over it. Otherwise: MP3 player!