Robert's vertical paintings were hung between windows with a stylized park view. The low vantage point and contrasts of light and shade emphasize the movement of the architectural mass depicted by the artist.
Robert's landscapes are the product of a refined imagination. He used the same motifs in endless combinations, creating a majestic, poetic image of the past. His actual manner was somewhat improvised: apparently random details, architectural fragments or genre scenes, suddenly appeared in his pictures, invading a monumental scene.