Some filming was shot on the Korean War Veterans Parkway in Staten Island, NY. The film used six sound stages, spread over three studio lots. Principal photography began on November 8, 2004 and wrapped on March 7, 2005. Industrial Light & Magic was the main special effects company for the movie. While Spielberg had used computers to help visualize sequences in pre-production before, Spielberg said, "This is the first film I really tackled using the computer to animate all the storyboards." He decided to employ the technique extensively after a visit to his friend George Lucas. In order to keep the realism, the usage of computer-generated imagery shots and bluescreen was limited, with most of the digital effects being blended with miniature and live-action footage. The design of the Tripods was described by Spielberg as "graceful," with artist Doug Chiang replicating aquatic life forms. At the same time, the director wanted a design that would be iconic while still providing a tribute to the original Tripods, as well as intimidating so the audience would not be more interested about the aliens inside than on the vehicle itself. The visual effects crew tried to blend organic and mechanical elements in the Tripods depiction, and made extensive studies for the movements of the vehicle to be believable, considering the "contradiction" of having a large tank-like head being carried by thin and flexible legs. Animator Randal M. Dutra considered the movements themselves to have a "terrestrial buoyance", in that they were walking on land but had an aquatic flow, and Spielberg described the Tripods as moving like "scary ballet dancers". Most of the alien elements revolved around the number three – the Tripod had three eyes, and both the vehicle and the aliens had three main limbs with three fingers each. Visual effects supervisor Pablo Helman considered depicting the scale of the Tripod as challenging, considering "Steven wanted to make sure that these creatures were 150 feet tall", as it was the height described by Wells in the novel. The aliens themselves had designs based on jellyfish, with movements inspired by red-eyed tree frogs, and an amphibian quality particularly on the wet skin. A styrofoam alien was used as a stand-in to guide the actors in the basement scene. Spielberg did not want any blood or gore during the Heat-Ray deaths; in the words of Helman, "this was going to be a horror movie for kids". So the effects crew came up with the vaporization of the bodies, and considering it could not be fully digital due to both the complexity of the effect and the schedule, live-action dust was used alongside the CGI ray assimilation and particles.