Illusion: Fast and Slow

I saw something interesting from Chia Yi's blog.

What's so special of the photo above?

In the photo, you are seeing moving forward in a places that full of rooms at the both side, right?

Now, try to cover the both side of the photo with your finger.

Okay, and now, cover the center of the photo.

Notice anything?

When you cover the both side, it move slower.

When you cover the center part, it move faster.

Interesting?

MAGIC!!!