March of penguins on the hyperbolic plane:
This is an example of a tesselation of the
hyperbolic plane by fundamental domains of a Fuchsian group with cusps.
Cusps correspond to yellow horocircles on the picture. Notice
that horocircles are metrically distorted in the hyperbolic plane since
the Euclidean size of penguins which live on horocircles is decreasing
much slower than the size of penguins which do not live on a common horocircle.