A small bit of this mural.

"LaBossiere, who worked with eight interns and assistants to create his latest mural at St. Mary Home, estimates that the expanse of 2,200 square feet of concrete took more than three million brushstrokes to cover. Rather than paint the bare concrete with a skyscape, for example, LaBossiere chose a design that reinvented the wall as a classical stonework that appears real thanks to a cunning use of dimension and perspective." Source: The Hartford Courant