Interesting hyperbolic shapes

[Alef]

These shapes looks interesting:
http://en.wikipedia.org/wiki/Hyperbolic_geometry#Visualizing_hyperbolic_geometry



Throught there is no formulas for that.
But google brings strange book, how you can knit these hyperbolic shapes
http://www.math.cornell.edu/~dwh/papers/crochet/crochet.html

(Her husband used paper models to show the students hyperbolic shapes, but paper models was too frail. So she knited hyperbolic shapes.)


Probably some transformations could create something like that. Pretty cool shapes, I think.