Guggenheim and Centre Pompidou his early works were historical scenes in a realistic style. I suppose they look like this, A Papal Ceremony, which is dated 1904.
lecture in French on the Pompidou Center web site that argues the real aim of these early abstractions was telepathy:
Many pioneers of abstraction considered non-objective painting as a transitional step before the more radical solution of a direct transmission of emotions, "spirit-to-mind."Study for the Language of Verticals, 1910-1912.