Why am I entertained by this?
 

http://chir.ag/stuff/sand/

This is an odd one. It's hard to even describe how the thing works, but I'll do my best (you can figure out the rest by messing with it).

There are 10 elements to play with: Walls, fire, water, plant, sand, cera (most likely means wax), ??? (???), oil, salt, and of course Namekuji.

To start, there will be, falling from invisible spouts, one stream each of sand, water, salt, and oil. You can tell which is which by looking at the colors at the bottom. You can control the size of the flow of these 4 by clicking on their name in yellow on the bottom right. Click enough, and it will turn it off.

Each element interacts in a predictable way with all the others. And you can create any of the elements by selecting it from the colored list below and drawing in the "play" area. You can also click "spout" and make a constant flow of water anywhere in the area. Here's what each elemnt does.

Wall: pretty obvious, forms a barrier that stops everything from getting through

Water: flows like water, puts out fire, makes plants and Namekuji grow

Plant: starts as whatever shape you draw, grows when watered, burns rapidly

Oil: flows like water, burns

sand: falls, floats on oil and water, dissolves water spouts and Namekuji

Cera: acts like a wall for the most part, but it's flamable. It burns slow and long

Salt: Shrinks the namekuji

Namekuji: I've figured out that it's Japanese for slug. So that explains why it shrinks with salt. It doesn't explain why it's a yellow pointy blob. It can also catch fire.

???: I don't know wtf this is supposed to be, but it just makes things go crazy.

There's also an eraser (hard to see the text, it's betwee oil and salt in the list)

So, umm, yeah. Bizarre, but strangely addictive. Up above are 6 screenshots of what other people have done. I particularly like #2 and am in the process of recreating it.

Damn you GD.

^^^ Yeah. What he said. So. Freakin'. Hooked....

Ooh question mark thingy....

Mesmerizing...

I think the ??? is napalm.

That was my guess as well.

Perhaps, though it leaves the plants completely unharmed, which is odd.

Allow my to also present my scorn to GD. Geez, what if I was to start putting heroin in your food. Would that be fair? None less fair than providing this link.

How do I tell Matthew that I can't drive him to work today because I'm working on something important?

Edited to add: It is very zen-garden like and now I feel nothing but love. Thank you GD, for this wonderful gift.

Edited to also add: Damn it all to hell. I hit the "?" and there goes my beautiful zen garden. Grrrrr.

To quote Nelson Muntz from 'The Simpsons':
Haw Haw!
:D