Counter-Rotating Spirals Illusion

More Java applets here. If your browser supports Java, you should see an animated image above (generated by a Java applet embedded on the page). Otherwise, you should see a static image. Instructions for Viewing the Illusion: Sit about 50 cm (20 inches) from the screen. The User Interface: Start/Stop Button The Start/Stop button starts/stops the applet's rotation thread. Detach/Attach Button The Detach Button detaches the applet from the Web page and places the applet in its own frame window. Speed Control The Speed Control varies the speed of the animation in a range of 1 through 120 RPM. History of this Illusion The illusion is an example of the "Motion Aftereffect" phenomenon. This effect was described in the early 19th century by R. In 1935, the artist Marcel Duchamp produced a set of 12 rotating optical illusions called Rotoreliefs. In the 1970's, a number of Psychologists were actively studying the phenomenon. Jerry says: "I was aware of the spiral disc that gives that after effect. Dr.

29 Semi-Productive Things I Do Online When I’m Trying to Avoid Real Work | Marc and Angel Hack Life You don’t always have to work hard to be productive. Productivity can simply be the side effect of doing the right things. So here’s a list of 29 semi-productive things I do online when my mind is set on avoiding ‘real work.’ Check delicious popular tags like ‘useful,’ ‘tutorials,’ ‘tips,’ ‘howto,’ ‘advice,’ ‘entrepreneurship,’ etc. for interesting, educational articles to read.Watch one of the thousands of educational videos streaming at TED.com, Academic Earth and Teacher Tube.Read an online book list and find a new book to grab next time I’m at the library. Oh, and ever since I bought my new (super sexy) Apple iPad , I’ve been enjoying all of these sites on the go and catching looks from almost everyone who passes me while I browse. So what kind of semi-productive things do you do online in your off-time? Photo by: Colorblind Picaso Party Casino Related 30 Life-Enhancing Things You Can Do in 30 Minutes or Less April 19, 2012 In "Happiness" 30 Ways to Save 30 Minutes a Day October 4, 2010