Police admit, that, although they are looking into cases of art forgery more often, it is still very hard to tell if the numbers are rising or not. Art has become a kind of __________(INVEST) so the market for forgeries and fake works is becoming larger. Forgers use the internet to help them sell phony works of art. On the other side , since it is easiest to fake lost or missing works of art, the internet can provide fast information on whether a painting or sculpture has __________(APPEAR) or not. Some forgers are even brave enough to copy works of ________(LIVE) artists. In one of the biggest forgery cases in history, Scotland Yard arrested Shaun Greenhalg, who created over 120 paintings and sculptures worth millions over the past 20 years. But many forgers may still be at large. Art experts say that, because there is such a demand in art, up to half of the art that is in ___________(CIRCULATE) may be a forgery. Most of it is sold at auctions in London. John Myatt was one of the biggest art forgers of the 20th century. He was ___________(PRISON) for creating fake Picassos and Renoirs. After he was relased in 2000 he has started to create his own art, which now sells at a rather high price.