A nice easy one for you here. There are six faces hidden in the rocks. Can you find them?
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Here is a great illusion of Harry Houdini, the famous escapologist. It was created by Tom Interval over at Interval Magic.  Which of these two pictures of the leaning tower of Pisa is the tower leaning the most? It looks like the one on the right, don't you think? Well they are actually both the same. 
If you stare at the eye on the left and then look at the eye on the right it turns brown. After a while the the eye on the right will look brown all the time.  We are not all about optical illusions here at Optical Spy. We do like Art of all kinds, but especially unusual art and photography (have you seen our Tech Art Gallery?). Anyway we thought this picture was both beautiful and unsettling., so thought you might like it too.  This illusion comes under the category of 'Hidden Message' as there is one hidden in the picture, but can you see it? The best way is to stand back away from your screen, the further the better and all will be revealed. 
 The illusion above is quite difficult to see, so we suggest that you start with the one below. Just stare at the black dot in the middle (try not to move your eyes away from the dot) and you will find the the words gradually but totally disappear. Just like magic. Now you have got the idea, give the picture of the tiger a go. Same thing just stare at the black dot and see if you can make the cat go away. Good luck. Let us know how you got on.  Here is our latest take on an old illusion. The checkerboard illusion. You know the one, where we point out two squares on a checkerboard (we know it's not really big enough to play actual checkers) and tell you they are exactly the same color. Well in our picture below it's the two squares with the Optical Spy logo in. Can they really be the same color, it doesn't make any sense. If you click on the picture you can see the proof. 
.We have put together this flash animation of how to draw an impossible triangle or Penrose triangle This is our latest illusion. We have taken an old favorite and added the illsion of depth, which we feel enhances the illusion somewhat. 
The Vitruvian Man is a drawing created by Leonardo da Vinci circa 1490. It is accompanied by notes based on the work of the architect Vitruvius. We have taken it and split it into two. Your mission (if you choose to except it) is to put it back together. Our best advice is to move a little bit further back and then go slightly cross eyed. After some practice it is possible to combine the two to complete Leonardo's great work. 
If you put nine of these hexagons together you can make a triangle, albeit an impossible triangle Click or hover on the picture to reveal it.  This is our new goldfish illusion. It's an after-image effect type illusion. Stare at the blue fish on the left for 30 seconds and then transfer you gaze over to the fishbowl on the right. 
We have produced a 'hidden message' in the optical below. Can you read it? The best way we found was to take our glasses off or get a bit further away from the screen. It will probably be one of those illusions that some people see easily and some won't see it at all.  We don't have an explanation for this optical, we were just playing around with the old impossible triangle illusion and eventually this is what came out. 
Polly the parrot has escaped from his cage. Can you help get him back in? Try going cross eyed. 
Can it really be true that the dot in the middle of the five on all three die is the same size? Of course it can this is Optical Spy!  We found a couple of beautiful pictures of a trees on the internet, but cannot find the originals, if you know who took them please let us know as we would like permission to use them. We then cut the pictures in half and mirrored them back on themselves. Now they reveal some lovely patterns some of which make us see faces in the trees 
Here's our interpretation of an old favorite. We have taken an perfectly symmetrical chequer board grid and added some circles to the black squares. By placing them in the correct place it makes the chequer board look like all the straight lines are wavy. Click the picture to see a larger view.  We have a montage of illusion for you. We have added eight things to this picture. Can you find them?
 Here is a great illusion we designed and have called 'Disappearing World'. The picture shows a planet, not unlike Earth, with it's moon orbiting it's beautiful orange star in the background. It has a beautiful blue and yellow atmosphere. But what happens if you stare at the center of the planet? If you concentrate hard enough your mind can make the atmosphere completely disappear before your very eyes. You might want to click on the picture for a larger view. It's what we call out of this world! The effect is explained over in the Spy Blog. 
Here is our latest illusion for you. It is a beautiful picture (origin) of a fire escape that we have, let's say, tweaked. So if there happened to be a fire in this building, you are pretty much screwed. 
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