In addition to its known meaning as video resolution as a definition, 4K also exists in a highly exciting niche: In the demo scene there are so-called 4K intro competitions. The task here is to store as sophisticated an animation as possible in a maximum of 4KB memory (4096 bytes!).
Not only (but also) clever compression is necessary, but practically all objects in the scene must be created and animated by mathematical connections. This kind of procedural design always produces exciting, aesthetically remarkable animations, which are usually very inspiring due to their minimalistic limitations.
The 4K-Intro winner of the Revision 2019 DemoScene competition ("Newton Protocol") looks like this:
How to place so much content in 4Kilobyte is described by the author himself _COPY11@jerry.ylilammi/making-of-newton-protocol-e9ccde41af30 (in a medium article).
And if you want to see all contributions to this year's Revision 2019 - Compo - PC 4K Intros, you can find them here: