Forth Haiku, linked in the comments, is also interesting:

http://forthsalon.appspot.com/

Interesting blog.

"radical low-complexity"

Love that.

"Retro"? Nah.

More like:

- responsive,

- easier to understand,

- capable and worthy of being maintained and repaired

- hence "built to last".

"Radical"? Nah.

More like: "Practical."

Some effects found after playing for a few minutes:

  dp**                 \ rolling columns
  dp*/                 \ teal and magenta rainbow quadrants
  wrd*                 \ rounded square field
  v8Msdv*vd*^wpp8r-    \ dripping columns

Click F12 and scroll to the bottom to find several examples to start from.

This is awesome.

I have no idea what I just watched but I thoroughly enjoyed it. More esoterica on HN please!