Lifepower has reminded us about the pseudo-annual Text-Mode Demo Competition...
<blockquote>

TMDC is a pseudo-annual demo-making contest held over the internet. TMDC8 is yet again organized by tAAt ry, a registered non-commercial organization in Finland, which aims to promote demo-making culture.

Text mode demos offer unique challenges for the demo maker which play a very insignificant role in other kinds of demo competitions. First of all, resolution and color spaces are rather limited, forcing the demo authors to consider different forms of anti-aliasing and careful adjustment of contrast and color balance.

Additionally the demo authors will not have any hardware-assisted rendering, forcing them to create their own rasterization methods, while giving them a huge amount of CPU power per pixel. Things like per-pixel real-time raytracing are a realistic choice in text mode demos.

</blockquote>
Read more about it on this thread and how you can use Delphi/Object Pascal to create these amazing demos.