  This contribution starts with an exchange between us on the way we met Guido
and he influenced our mathematical lives. Then it is mainly a survey paper that
illustrates this influence by describing different topics and their subsequent
evolution after his seminal papers and courses. Our main thread is the notion
of a space of homogeneous type. In the second section we describe how it became
central in pluricomplex analysis and consider particularly the existence of
weak factorization for spaces of holomorphic functions. In the last section,
one revisits the construction of a basis of wavelets in a space of homogeneous
type and the way it allows a Littlewood-Paley analysis.
