Adam uses it to map out the placement and scale of the piece according to the size of the wall ... the art of layering very specific colors in order to turn regular spray paint into something ...

While browsing the National Portrait Gallery this month, visitors initially might think that the museum walls have been ... who have both been spray-painting (or "tagging") trains and bridges ...

Not all all street art is spray paint and wheatpaste. London Kaye crochets large colorful murals out of yarn and ties them up to walls and fences. We spoke with Kaye in Brooklyn to watch how she ...