In the meantime, other changes had also taken place: Satie was a member of a radical socialist party (he later switched his membership to the Communist Party in that area after December 1920), and had socialised with the Arcueil community: among other things, he had been involved in the "" work for children. He also changed his appearance to that of the bourgeois functionary with bowler hat, umbrella, etc. He channelled his medieval interests into a peculiar secret hobby: in a filing cabinet he maintained a collection of imaginary buildings, most of them described as being made out of some kind of metal, which he drew on little cards. Occasionally, extending the game, he would publish anonymous small announcements in local journals, offering some of these buildings, e.g., a "castle in lead", for sale or rent.