Someone out there has a problem with art. Or at least a certain kind of art and artist.

The evidence is the bright green and purple splashes of paint that began appearing on walls in Brooklyn and Manhattan more than a month ago. The carefully aimed blobs obscured or disfigured dozens of pieces of street art created by people who may not be household names, but who have achieved the esteem of peers and some recognition from the mainstream art world. The targets of the paint attacks have included posters, paper cutouts pasted on walls, and images stenciled on the sides of buildings.

Many of the paint splatters were accompanied by messages printed on plain white sheets of paper and pasted near the splatters. Those communiqués appeared to condemn the commodification of art, but it is difficult to be sure what the messages really mean. One reads, in part, "Destroy the museums, in the streets and everywhere." The author has kept his or her identity a secret.

Word of the covert actions spread quickly through the street art community. Web logs began documenting the splatters. Soon the unknown protagonist was named the Splasher.