A Surface which is related to Cayley Numbers.
References
Coxeter, H. S. M. Regular Polytopes, 3rd ed. New York: Dover, p. 211, 1973.
Hunt, B. ``Del Pezzo Surfaces.'' §4.1.4 in The Geometry of Some Special Arithmetic Quotients.
New York: Springer-Verlag, pp. 128-129, 1996.