I’m afraid I haven’t posted for a year, so this is just to note that the brilliant Best Illusion of the Year Contest has come around again. This year it’s an all internet event and you will be able to vote online for the winning illusion from 7pm USA EST on 11th June to 7pm EST on June 12th . I’m afraid you won’t be able to vote for me because our entry didn’t make the short list – but that just shows how brilliant the competition is.
Update 13/6/15. The winners are now online, and it’s a vintage year! Three stunning illusion movies, and several other really good entries.
Meanwhile here’s a version of the illusion I’ve been working on with my colleague Priscilla Heard. The bright V shaped zones imposed on the faces look like they are expanding sideways, especially near the sharp end of the Vs at the bottom. But to the right an isolated bright zone shows that objectively the V tracks are quite static. You may still see a bit of illusory lateral expansion even in this isolated set of tracks, but note that the top right corner of the track is quite static in relation to the corner of the movie.
It’s a version of the Witch Ring Illusion. I posted about that back in 2011, noting a plan to take a look at it. This year Priscilla and I published a paper about it in the journal Perception. Unfortunately you won’t be able to read the article unless your library subscribes, but you will be able to see the Witch ring explanation videos published by Perception. They’ll give you an idea of what it’s all about. And I’ll be posting again on the subect.