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"When the glasses are in the tray, the eye chart appears in focus. When the glasses are removed, it appears blurry. Concept by Fiona Carswell for an eyeglass tray using thermochromatic ink and a pressure sensor."
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A technique page from a working photographer with quite a few useful tips and technique articles linked off it.
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Lots of great stuff in this talk from Mike Kuniavsiky from this year's ETech. I like this explanation of (the confusingly-titled) "avatar", and some of his points on service design are excellent. Lots of meat in here; make sure you get the PDF.