Hello All, I hope you will find the following quote amusing: Something great and hard to describe a topos seems to be, for it is a matter and a form simultaneously. Aristotle. Physics (4) 212a Be warned however that this is the translation to English of the Russian translation of the Greek original. English translation by R. P. Hardie and R. K. Gaye uses ``place'' in stead of ``topos''. Nikita.