Recently, the Feynman Lectures on Physics became free to read on the web. In the chapter on the eye - http://feynmanlectures.caltech.edu/I_36.html#Ch36-F1 - there is mention of an illusion. I had to give it a try, and QCAD is my tool of choice for such drawings: Although they are not strictly CAD, it has the right tools to construct certain 2D vector grafics.
So, attached the drawing and below a foto of what the thing looks like - beware though, that the effect is only visible with the real stuff, the foto cannot capture it. First I tried with the electric drill, but that went much too fast. More mundane it works when built as a top. Speed is very essential, one has to wait a little in order to see; especially in a dim room and the disc below a light bulb the effect will show very good.
Drop in here to discuss whatever you want.
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Cool , I'm going to laser cut some of these....so, that's all my Christmas presents sorted out - just kidding
For the best support please state your operating system, QCAD version and add any supporting DXF/DWG files, screenshots etc...
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