Out of curiosity, I clicked and waited.
Here is the link.
As the website is in Japanese, you must read the synopsis here first:
How does the small arrow on your computer monitor work when we move themouse?
Haven't you ever wondered how it works?
Now, through the miracle of high technology, we can see how it is done.
With the aid of a screen magnifying lens, the mechanism becomes apparent.
Click on the link below and you will find out.
The image may take a minute or two to download and when it appears, slowly move your mouse over the light gray circle and you will see how the magic works.
Follow this link and find out the truth and how satisfying it
is to KNOW.
Remember to do the following:
1. Switch on your speakers
2. Move the mouse all over your screen before moving it over the light gray circle
3. Left-click your mouse