A detailed look into the urban phenomenon of formstone in Baltimore, Maryland. From its invention as a technique, to its cultural significance and aesthetic impact as a ubiquitous streetside presence, and on to its role as an architectural emblem of socio-political transformation initially in the 20th Century and again now in the 21st; John McCartin takes a humble, colourfully applied surface finish, and reveals it to be a unique and potent agent provocateur in the perpetual field of representation and transformation that are our inner cities.