3-D glasses were glasses usually made out of cardboard, and two transparent colored wax paper lenses, usually red and blue respectively, for use in watching three-dimensional movies. These were made to increase business of movies after the rise of television caused many customers to switch to television instead. Thousands of movie houses closed up shop in the 1950s. Although many 3-D movies of the 1950s were low budget "creature features", one noteworthy movie was shot in 3-D, House of Wax, which was medium-budget and intended for a more mainstream audience. Part of the reason for the lukewarm reception of Alfred Hitchcock's The Birds was that Hitchcock filmed it using special three-dimensional cameras, but by the time the movie was released, 3-D was largely out of style.