Bret Victor gave an entertaining talk on the history and/or future of computing at DBX 2013. In addition to the fascinating subject matter, Bret took the charming step of presenting with transparencies and an overhead projector†.
We’re abusing -webkit-mask-box-image, so for the full experience you’ll need Safari or Chrome. Firefox works, but you’ll be missing out on the “virtual glaucoma” effect.
Feel free to use TransparenCSS as a base for your own retro-future conference talks.
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†Technically, an overhead projector fitted with a camera in the armature. Presumably, it would have taken a fairly strong bulb to project an image large enough for the entire conference hall…