Antonakos started to design his Chapels and Meditation spaces with neon in the late 1980s and continued through the rest of his life. Their roots lie in his lifelong commitment to Greek Orthodoxy and in the evolution of his activation of geometric space. They include his 1993 Chapel of the Saints in a fortress in Rhodes, which he described in a letter to Elias Kollias as being, at that point, "the masterwork of my life." The full-scale iron Chapel of the Heavenly Ladder was exhibited in the XLVII Venice Biennale and is permanently installed now in Thessaloniki. In 2003, the Greek art critic Alexandra Koroxenides wrote of Antonakos's "capacity to create surroundings of meditation and spirituality." Many Chapels have been created for important temporary exhibitions here and in Greece, and small precise models exist for more of them.