Biology
Population Age Pyramid
Nₓ ∝ e^(−g·x)
Age structure of a growing population: a higher growth rate g stacks ever more people into the youngest cohorts, giving the wide-based pyramid of an expanding society and a flatter column as growth slows.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).