“The Tate Gallery by Tube”

1685
"A poster depicting the tube map represented through different coloured paints from a tube. The Victoria Line is in the process of being drawn by a tube of paint upon which the London Underground sign is depicted containing the word 'PIMLICO'."—https://collections.vam.ac.uk/item/O219050/the-tate-gallery-by-tube-poster-david-booth/