Archives: The City is Not a TreeA City is Not a Tree By Christopher Alexander Originally published in: Architectural Forum, Vol 122, No 1, April 1965, pp 58-62 (Part I), Vol 122, No 2, May 1965, pp 58-62 (Part II) Part I The tree of my title is not a green tree with leaves. It is the name of an abstract structure. I shall contrast it with another, more complex abstract structure called a semilattice. In order to relate these abs
