15 optical illusions that will blow your mind - A small collection of weird and wonderful gifs.

Everybody loves a good optical illusion, and when it’s small enough to keep on your phone to share it with friends- it’s even better!
Here are fifteen of what we think are the best optical illusion gifs on the web. 
Enjoy!

1. Stare at the center of this for a minute and then look away!

1.  Stare at the center of this for a minute and then look away!

2. In which direction is the train going?

2. In which direction is the train going?

3. Can you work out how this works?

3. Can you work out how this works?

4. If you stare at the green dot, the yellow ones disappear.

4. If you stare at the green dot, the yellow ones disappear.

5. Stare at the the black dot. Is the next photo black and white?

5. Stare at the the black dot. Is the next photo black and white?

6. This floating cube will have you baffled.

6. This floating cube will have you baffled.

7. When will this skyscraper end?

7. When will this skyscraper end?

8. The impossible chair.

8. The impossible chair.

9. Are these colored boxes moving at different times? (no they're not!)

9. Are these colored boxes moving at different times? (no they're not!)

10. It never changes size.

10. It never changes size.

11. This is just saucery.

11. This is just saucery.

12. You weren't expecting that.

12. You weren't expecting that.

13. Where did the extra square go?

13. Where did the extra square go?

14. The impossible rooftop.

14. The impossible rooftop.

15. Do the blocks change shade?

15. Do the blocks change shade?

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