This is an expanding image of Albert Einstein. Or is it Marilyn Monroe? Your answer will say a lot about your eyesight. Chances are, you saw both at some point, which is normal. Check it out below:

The important thing to note is, when did you realize the image was changing?

When the image is further away and smaller, you might see Marilyn, but as it got bigger and closer, you probably saw Einstein. The quicker you saw Einstein, the better your eyesight is.

The photo is a hybrid image of low and high spatial frequency which is used to test our eyeballs. Here's how it works: