While completing a relentless set of errands for his master's wife, Taddeo (in the background) stops to admire a painted palace facade. On returning he is put back to work grinding pigments, but—imagining the facade—he draws the scene from memory with a twig in the powdered paint colors. To make it clear that each of the figures in the drawing is Taddeo, Federico has inscribed his brother's name on his tunic.