TETRAGON implemented through the years various interventions in the public space of Thessaloniki and other cities, marking significant locations and important cultural events.

From the metallic oak tree in Alexandroupolis, Elephantastico, the stage of the Jazz Festival in 1985, the visual signage for the Mediterranean Crossing in 1991, the pennons of the city walls and the metallophone for Thessaloniki Cultural Capital 1997, are some of the interventions that marked events and locations.