At times, production designer David Willson has to build entire sets, or props for sets, from scratch instead of finding an available alternative. For "Witness", David Willson found an abandoned warehouse to use for the scene where Clark is thrown into a furnace by the three kryptonite-powered thieves. In the warehouse, Willson built a , blast furnace. In "Visitor", David Willson and his production crew built a "practical, functioning" tower for the scene in the woods where Cyrus attempts to call for his alien transport. Willson's inspiration came while working on Love Field, starring Denzel Washington and Michelle Pfeiffer. While working on the project, Willson met a man named Bowler Simpson, who had built a memorial, to his deceased daughter, out of old license plates and STOP signs. Willson used this image when constructing Cyrus's tower. Even though the tower was physically built, Entity FX still stepped in to create 2-D light beams located on the tower. Willson also likes to add elements to his sets that correlate thematically with the episode, like in "Red", where Clark is exposed to red kryptonite. Here, Willson emphasized the "red theme"; working with director Jeff Woolnough, Willson tried to make sure there was something red "popping-out" to catch the audiences' attention in each scene. This would include red objects in the foreground and background, as well as red lenses added to the cameras. Going along with the theme of colors in the show, Metropolis was given a "glass and steel and blue wash of color" for the look of the city. The crew found a new building in Vancouver, which was not yet occupied, and turned it into LuthorCorp plaza. By coincidence, the building sat neighboring the Marine Building, which Gough and Millar had always seen as becoming the "Daily Planet" building for the series, as the Marine Building held an "art deco structure from the 1930s" they felt embodied what their version of the "Daily Planet" would look like.