Can You Tell What Each Of These Paintings Have In Common?

A common but often overlooked technique in art

Hello, 

It’s a rainy day in Paris. The street teems with umbrellas, hats and frock coats.

On the right side of the image, a couple walks toward us. Meanwhile on the left the street opens out, giving us a view of modern Paris in the late 19th century.

The question is: can you spot the similarity between Paris Street; Rainy Day — painted by Gustave Caillebot…