The D series is the result of a deep research of the artist conducted on techniques and colour. The main topic of the research is that of a universal applicability of colour on any support, from canvas and cardboard to the plain street. The success of the D series is also confirmed by the bright success of works that we can define properly urban, independent, unconventional and absolutely unique, mirror of the polyhedral poetic painting of Difilippo. In the last pieces of the D series, currently in processing and continuous development, the studied chromatic stratification is combined with an improvised composition, as in jazz.