a high pressure cleaner which he uses to spray water on to the wall darvon has worked for years with technician excitement from the cash a company which makes the cleaners for this project the water from a high pressure water gun comes directly from the mediterranean. the senses that it does not use is in the fact that water is the only way to achieve such a brilliant contrast when you clean off the organic material it gives rise to such clear contours that lend the figures an astonishingly expressive quality. stone. delvin uses wood stencil to create his reverse graffiti images. he s planned a series of thirteen portraits for the harbor wall portraits of people who once lived in set. of. books and colleges with old photos of set and i ve picked out the most expressive faces i don t want