Confuse Yourself

Here are some images that have been circulating on the web. Here's the first challenge: Try to count the black dots!

Can you tell which group has the bigger centre circle? The left or right one?

Look at the central dot. Now move move your head forward to and back from the screen. Creepy.

Here's another one.This is a static image: the movement is just in your mind. Click on it to enlarge.

Read this and say the word, not the colour (for some reason this is most effective for native speakers)

How many legs has the elephant, and how many feet?

Stare for some time at the central black dot.
After a while, the haze around it will shrink.

Are_all_lines_straight?