Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci

Of several bodies, all equally large and equally distant, that which
is most brightly illuminated will appear to the eye nearest and
largest. [Footnote: Here again the diagrams in the original have no
connection with the text.]

255.

If several luminous bodies are seen from a great distance although
they are really separate they will appear united as one body.