Demand for human directionals has significantly increased since the introduction of sign-twirling techniques. In temperate and warm locations, sign holders can be employed year-round and their effectiveness has been amply demonstrated. For example, during the month of October 2006, nearly 8% of the 3,600 people who visited model homes in a housing development in Moreno Valley, California were directed there by human directionals. The Entertainment Factory in Florida provides human directionals to several successful businesses in Central Florida. Some use them as their sole form of advertising. Naturally, there are concerns that just as in 19th-century London, as human directionals become more and more commonplace, their effectiveness will be diminished.