Alessio Tasca, square glazed Ceramic vase, Italy, 1970s

In 1967, together with Ettore Leoni, a technician from Nove, Vicenza, where Tasca opened his first ceramic atelier in the 1950s, he developed the first extruder, a machine that allowed him to design and produce his first rectangular-section works through extrusion. He exhibited them for the first time in Treviso in 1968, at the "Studio d'Arte Arturo Martini. That same year, he participated to the 14th Milan Triennale with 17 extruded pieces, including the Cornovaso, perhaps the most representative "form" of this cycle. The Triennale was occupied as part of the 1968 protests. Tasca actively participated, throwing down and destroying all the exhibited works.

In 1972, the Victoria and Albert Museum purchased a Cornovaso, which is still exhibited in the Decorative Arts section of the London museum. The international jury of the 15th Milan Triennale, where he exhibited ceramics and plexiglass, awarded him the Gold Medal Diploma for the methacrylate production created by the Fusina laboratory in Nove based on his own design.

With a larger die, in 1974 he extruded his first large-scale sculptures: the "Sfere" series, obtained from a cylinder extruded on a grid matrix. His artistic contribution thus definitively returned to sculpture itself.