"Whitespace" by Prismbeings
A 4k intro (compresses to 3900 bytes with Crinkler 2.0) released at Simulaatio 2016. Download Crinkler from http://crinkler.net/ and place it as "link.exe" at the root of the project*. Both the original shader and minified are included. Compiled under VS2013, should work on newer versions as well. See releases for a compiled version.
The content of the intro is licensed under CC BY-NC 4.0, more info: http://creativecommons.org/licenses/by-nc-nd/4.0/
AO solution based on XT95's "Hemispherical SDF AO": https://www.shadertoy.com/view/4sdGWN
Some distance function formulas provided by "hg_sdf" by Mercury: http://mercury.sexy/hg_sdf/
(* Not needed to compile the project, but essential to produce an actual sub 4 kilobyte executable.)