SECKEL A., HOFSTADTER D. R. 2007. Masters of Deception: Escher, Dali & the Artists of Optical Illusion. Sterling
KOENDERINK J. 1990. Solid Shape. MIT Press, Boston MA.
KOBAYASHI S. & NOMIZU K. 1996. Foundations of differential geometry Vols 1&2. Wiley-Interscience

D’ARCY THOMPSON W. 1917. On growth and form. Cambridge University Press, UK.
WEYL H. 1952. Symmetry. Princeton University Press. Providence, RI
DIJKSTERHUIS E. J., STRUIK D.J. et al. (Eds.) The Principal Works of Simon Stevin. Lisse: Swets & Zeitlinger