"These delightful street 'carpets' by artist Arthur-Louis Ignoré (or Ali) of Rennes, France, overlays beautiful, abstract representations over an existing urban context..."

Treehugger reports — without more detail on that name "Ignoré." The word translates as "unknown." I assume it, like the acronym "Ali," are assumed names, chosen for a reason. I'd like more detail. Look at the photographs of the artwork at the link and weave your theories.

Note: It should be "overlay," not "overlays." And "overlay... over" is bad.

A post shared by Ali (@arthur_louis_ignore) on May 31, 2018 at 10:00am PDT

AND: In the comments, SeanF very aptly says, “Note: It should be "is an assumed name," not "are assumed names." And "assume... assumed" is bad.”