In 1948 he co-signed the Manifesto of Eaismo, an analysis of man's new role in the "atomic age", alongside the poet Guido Favati and the painters Voltolino Fontani, Angelo Sirio Pellegrini and Aldo Neri.
He participated in the group's exhibitions in 1949, at the Casa di Dante in Florence; in 1953 at the House of Culture of Livorno, and finally in 1959 at the gallery Pascucci in Grosseto.
During this period Landi devoted himself actively to debating ideas in contemporary art through columns in major newspapers, especially "Il Giornale del Mattino" (Florence).
In the 1960s he formed the painter's group 'Gli Ultimi' together with Fontani and Pellegrini Sirio and exhibited continuously at the Bottega d'Arte Livorno.
His paintings usually depicted 'atomic landscapes', in which the descriptive and narrative element is reduced to the pure essence of forms, showing a keen sense of abandonment and loneliness.