I am old enough to remember when blinking text was a pretty big deal on the Internet. We have come a long way since then, to put it mildly. If you have a fairly recent PC with decent graphics, and a modern web browser that supports HTML 5, you should go see this page. It features an computer-generated animation you can interact with - the instructions are on the page itself on the right side. Another example would be this page, where the "liquid particles" are affected by your mouse movements. These sorts of demos are often put forth to show how HTML 5 may be used to replace or improve upon Adobe Flash for some interactive web elements.