Above is a painting by the 19th century naturalist Ernst Haeckel, who was astonished by the endless variety and complexity of such creatures.
- Salingaros, Nikos A., and Michael W. Mehaffy. "Ch 17. Alexander’s Sustainable Technology" In Design for a Living Planet: Settlement, Science, & the Human Future. Design for a Living Planet: Settlement, Science, & the Human Future. Levellers/Sustasis Press and Vajra Publications, 2015. Digital Library
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- "Figures." In Design for a Living Planet: Settlement, Science, & the Human Future. DFLAP. Levellers/Sustasis Press and Vajra Publications, 2015.
- "Ch 17. Alexander's Sustainable Technology." In Design for a Living Planet: Settlement, Science, & the Human Future, 175-179. Design for a Living Planet: Settlement, Science, & the Human Future. Levellers/Sustasis Press and Vajra Publications, 2015.
- "A tecnologia sustentável de Christopher Alexander." publisher: zeta.math.utsa.edu, 2011.
- "Excerpt from: La Tecnologia Sostenibile di Christopher Alexander." publisher: nemetonmagazine.net, 2012.