You have probably seen our gallery on 3D chalk art, but this is the first time we've seen 3D moving anamorphic chalk art.

Thanks to Maric for showing us this great video. Maric advises us that:

'When the arrow is moved to a particular distance behind the glass, it looks like it reversed itself. When light passes from one material to another, it can bend or refract. In the experiment that you just completed, light travelled from the air, through the glass, through the water, through the back of the glass, and then back through the air, before hitting the arrow. Any time that light passes from one medium, or material, into another, it refracts. Just because light bends when it travels through different materials, doesn't explain why the arrow reverses itself. To explain this, you must think about the glass of water as if it is a magnifying glass. When light goes through a magnifying glass the light bends toward the center. Where the light all comes together is called the focal point, but beyond the focal point the image appears to reverse because the light rays that were bent pass each other and the light that was on the right side is now on the left and the left on the right, which makes the arrow appear to be reversed.'

Click on the picture to see what is going on.

Stare intently at the centre of this swirl for at least 20 seconds and then look at the back of your hand.

Two very symmetrical patterns which when combined seem to produce bent lines

Swiss artist Felice Varini creates amazing anamorphic illusions using an eye-deceiving technique called anamorphosis. The complete shapes are only seen when viewed at certain angles, otherwise the viewer only sees some random broken pieces. Via DeMilked

Can you read the hidden message?

Why would anyone want to live in this building? Unless you have one leg longer than the other that is. This is a genuine photograph of a street in the west of the US. Can you guess which City?

We have made a small change to this picture. Can you find it? Click on the picture to see the original.

This unusual picture was taken after a flood near Bishop’s University in Lennoxville, Sherbrooke, Quebec, Canada. Thin ice sheets, covered in snow, can be seen half way up the tree trunks; a result of the flood water freezing and then retreating.

Picture credit unknown

Credit  NIKOLAJ ARNDT

A great tattoo optical illusion by Cory Fugruson

These two halves of jewel encrusted plates are the same size.

Here's a great illusion showing five stars in the Milky Way, but which one is closest to the central super massive black hole? Click on the optical to reveal the answer.

This guy looks like he doesn't know if he is coming or going. Is it just a trick of the light or has someone been photoshopping?

The Trick Eye Museum is located in the lively Hongdae district in Seoul, South Korea at the second basement floor of the Homi-hwabang building and has proven to be a popular destination for tourists. It specializes in providing amusements that trick the eyes into seeing something else. In addition to various trompe l'oeil installations, the museum also houses a Greek-style cafe, an educational room for learning Greek mythology as well as exhibit halls featuring contemporary artists.