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One of the cheapest and most useful tools I own is a small length of optical fiber with a shroud on one end that connects to a Maglite pen, with which I can illuminate inaccessable places inside computer towers buried below desks. An even better product than this would be a few hundred thousand hair-thin,
tapered fibers bunched together in a flexible endoscope cable that flared out to monitor size at one end, and to a ~1 inch screen at the other. With the big end clipped to the VDU I could work on the BIOS and OS while I was below deck, without diving in and out every five minutes constantly cracking my head against pointy things.
Other possible uses are watching TV or working/playing on the computer whilst reclining in easy chair, bed or bath, or using a smaller version as a cheap HMD for a wearable laptop without all those hideously expensive bleeding edge microelectronics, lasers, and MEMS.
Tapered Optical Fiber (Image Conduit)
[bristolz, Dec 15 2001, last modified Oct 04 2004]
||I think these are called "image conduits."
||I like this idea as I frequently find myself in the same position. Still need to reach the keyboard, though.