I take the RSS feed from DIYPhotography.net. Today there was reference to an interesting update on an old optical illusion. In the past this has been a 2D static illusion but now you can see it in action as a video. Though a simple illusion it really does make the mind boggle.
Click here for the link to the video on YouTube
If you go there and click on 'Show More' there is an explanation of how it works and even a link to a jpg file so you can try it out, in 2D, for yourself.
15 hours ago