In 1973, street painting was being promoted in Italy by the formation of a two-day festival in Grazie di Curtatone in the Province of Mantua. In the 1980s, Kurt Wenner practiced '3-D pavement art', or one-point perspective art, otherwise known as anamorphic art, a 500-year-old technique, which appears in proper perspective only when viewed from a specific angle. Festivals The first recorded street-painting competition and 'festival' was held in London in 1906. In 1972 the first 'Italian' International Street Painting Competition was held in Grazie di Curtatone, Italy. It is part of festival celebrating the Assumption with the streets of the city being turned over to the festival. In 1987, Wenner and Manfred Stader introduced street painting to Old Mission Santa Barbara, California. One of the largest events in the United States is the Lake Worth Beach Street Painting Festival, held in Lake Worth Beach, Florida. Started in 1994, it attracts 100,000 visitors over the weekend to see 250 works of art by over 400 artists. In 1993, Rosy Loyola created Festival Bella Via in Monterrey, Mexico, which has launched several Mexican artists into the international street painting field. Within the years it has become the most important street painting festival in Latin America. Started in 2002, The Denver Chalk Art Festival on Larimer Square, located in Downtown Denver, is a free two-day street-painting festival. More than 200 artists spend hours during the weekend turning the streets of Larimer Square into a museum of chalk art. The Festival is produced by the Larimer Arts Association, a nonprofit organization dedicated to promoting arts awareness and education in Denver. In 2008 Mark Wagner and 6,000 people (over 4,000 elementary school kids from Alameda, CA) set a Guinness World Record for the World's largest Pavement Art covering over 90,000 sq. ft. (8,361 sq. meters). A satellite photograph was taken of the artwork. In 2010, the First International Street Painting Festival held in the United States was organized by Denise Kowal, president of the Avenida de Colores, Inc. 501(c)(3) nonprofit corporation that produces the Sarasota Chalk Festival. More than 250 street painters attended the Halloween-themed festival of 2010 that featured street painters from around the world and ran for eight and a half days. In 2011 the First International StreetArt was staged in Wilhelmshaven in Germany. The event was scheduled to return in August 2012. At Sarasota's 2011 chalk festival Dutch artist Leon Keer