It seems that Lisbon metro is much more than just an infrastructure that gets you efficiently from A to B. Among a number of artists who were commissioned to give their touch to the metro stations there ever since 1950s, the biggest scope of work belongs to the lady named Maria Keil. Her work was particularly important for reintroduction of interest in azulejo in the contemporary context, since it was not so much used in the 19th and first decades of 20th century.
Another artist who also had commissions from the Lisbon metro company turns out to be particularly interesting for me: Eduardo Nery (1938-2013). Nery was working with decomposition of historical azulejos and these panels can be seen at the Campo Grande metro station. Those works are from the 1990s.
The same line of thought was developed at his panel for the EPAL building in Lisbon, from the same period.
Here I also enclose a photo of Praça da Município in Lisbon (he was very active with his interventions in public spaces). In this work from 1997-1998 period, he merged his Op-Art background and the possibilities of traditional calçada portuguesa (the cobblestone paving).
Something to be researched in detail in the future, I think.