She lowered her eyes towards the large black flags which paved the room.

[99bottles]

I know that coordinative adjectives must be separated with commas. However, on Google Books, I rarely see someone do that. For example, the sentence below, which I found in the page below.

She lowered her eyes towards the large black flags which paved the room. (No comma between large and black.)

The Life of a Simple Man

In order to “show the gents of Moulins, of Paris and elsewhere, just what a sharecropper’s life is like,” Emile Guillaumin, under the guise of fiction, wrote this story of “Tiennon,” a French peasant born fifty years before him in 1823. A peasant himself, Guillaumin was unique in that, after a...

books.google.gr

Can someone please explain when commas can be omitted between coordinative adjectives?

 

[jutfrank]

Do the usual test: say it in your head and if you notice a pause, you could probably do with a comma.