We all know what laser-cut steel is, and you've probably heard of steel cut by waterjets as well; but an even cooler way to cut steel is chemically, whereby you mask off an outline and use etching chemicals to remove the excess material.
As an example of this particular production method, check out Berlin-based design studio KIX's Screwless Eyewear for IC! Berlin. Self-professed lovers of "cutting-edge design technology," KIX used chemical cutting to fashion the IC! Berlin pieces, and designed them to fit together (the eyeglass frames and earpieces are separate) to create a screwless hinge.
Hit the jump for more shots.
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BTW - I have a pair and LOVE them. A great aspect of the design is that hinge holds together separate top and bottom halves of the frame - which in turn trap the lenses. Everything comes apart (and can thus be cleaned) very easily.