Setting off from the earliest stage of his paintings, which were mainly  figurative depictions, two sub-categories and periods emerged: the first one being referred to as the “grey brushstroke” (1940-1948) and the other one as the “vertical brushstroke” (1949-1950). These were followed by a period of “naive vision” with landscape paintings painted in a large number of variations. 

In the works from the period 1952-1957 can be clearly seen the procedures that Spyropoulos adopted in order to arrive at Abstraction, through the transcendence of the naturalistic object.