(This diptych depicts a father and son. On the left is Giuliano, the son who was an architect. On the right is his father, Francesco, who was an architect and musician. Notice Francesco’s left ear which looks bent outwards, as if he’s listening intently. In front of them are their tools (pen and compass, sheet music) which represent their disciplines. According to the Rijksmuseum website, both architecture and music “are based on notions of harmony and proportion” [https://www.rijksmuseum.nl/en/collection/SK-C-1367].)