Image source: Nilton Rocha
 OK, so this guy isn't really a giant, if you look carefully you will notice that he is standing on a ledge up above all the people in the background. But it does make you look twice, doesn't it? Image source unknown
 Yes, you guessed it. These two black squares are exactly the same size
Which of these three arcs will make the largest complete circle? Click the optical to find out.
These two cars look completely different sizes because your eyes see the 3D perspective you would normally associate with a 2D photograph. But the actual 2D size here is exactly the same. Original image source unknown.
Which of the three cut-outs below (A B or C) is the same size as the 'Big Man' on the train station and which is the same size as the 'Little Man'? 
Click to enlarge As we are shortly going to post an article on the Spy Blog about Forced Perspective we thought you might like to see a few pictures we found on the internet of the like. If any of the pictures are yours drop us a line and we'll give you a credit.
Here is a great reverse perspective picture for you. It's similar to the Patrick Hughes pictures we have posted before. You can catch them here The Wonderful World of Patrick Hughes and Patrick Hughes Corner Stores
Learn more about Patrick Hughes reverse perspective here Can these five little guys on their bikes actually be the same size as the big fellow they are following? Click on the picture to reveal the answer 
Original image credit - Youngja You Robb
OK, nice and easy perspective illusion for you. Which line is longer the left or the right. 
A bit of a reversal on the old perspective illusion for you here. Hopefully this one might fool you. The Moon Illusion shown here is an interesting one. The two two moons are exactly the same size but somehow the one on the horizon looks a lot bigger. You can see a few more of this type of illusion here - perspective illusions. 
We have designed a new perspective type illusion for you today. Here we have a typical skyscraper with two window cleaners cradles hanging from the top. The perspective of the photograph makes it look like the one at the top is much longer than the one at the bottom. But on the two dimensional picture they are actually exactly the same length. If you don't believe us, get your ruler out and measure it yourself. See - I told you. (don't you just hate know it alls) 
 Here we have two screens one large and one small. But this is optical Spy so something's not right. Could they possibly be the same height? Surely not, the one on right looks much much larger. Well of course it's an optical illusion - the centre of both screens shown with a red line is exactly the same height.
We have added a couple of flag poles with union jacks to this excellent picture by Mark Hare. Believe it or not the little flagpole in the bottom left hand corner is the same height as the larger looking pole over on the right.
 Our latest design is called 'Spaceships'. It shows two space craft fly into a wormhole. The largest one is in front followed by a smaller ship. So where is the illusion? Well it's that actually both ships are exactly the same size.
This is an illusion of the perspective type. On the left hand side we have a graphic representation of the seven tallest buildings in the world. The tallest is the Burj Kahlifa in Dubai shown on the far left. On the right hand side we have another picture of the Burji. The illusion is that the two pictures of the Burj are both the same height. You can get more pics of the tallest building here - The Worlds Tallest Buikdings
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