The illustrations above show a number of hyperbolic tilings, including the heptagonal
once related to the Klein quartic.
Escher was fond of depicting hyperbolic tilings, including "Circle Limit I" (Bool et al. 1982, p. 319), "Circle Limit III" (Bool et
al. 1982, pp. 97 and 320), and "Circle Limit IV" (Bool et al.
1982, pp. 98 and 322).