in an interview with New Scientist, director of photography John Read spoke of the advantages of circumventing the lack of agility so that the puppets "appear, for example, to walk through doors (although the control wires make this impossible) or pick up a coffee cup (although their fingers are not in fact jointed)." Live-action shots of human hands were inserted whenever scripts called for more dexterous actions to be performed. Special effects The scale model effects for every APF series from Supercar to UFO were directed by Derek Meddings, who later worked on the James Bond and Superman films. Knowing that Thunderbirds would be the "biggest project [APF] had worked on", Meddings found himself struggling to manage his workload with the single filming unit that had produced all the effects for Stingray. He therefore established a second unit under technician Brian Johncock, and a third exclusively for filming airborne sequences. This expansion increased the number of APF crews and stages to five each. A typical episode contained around 100 effects shots and Meddings' team completed up to 18 per day. An addition to the effects department was Mike Trim, who served as Meddings' assistant in designing vehicles and buildings. Meddings and Trim jointly pioneered an "organic" design technique in which the exteriors of models and sets were customised with parts from model kits and children's toys. Models and sets were also "dirtied down" with powder paint or pencil lead to create a used look. Toy cars and vans were used in long shot, while scale vehicles were equipped with basic steering and suspension for added realism. Miniature fans and Jetex pellets, which are capable of issuing air jets or chemical exhaust, were attached to the undersides to simulate dust trails. Another of Meddings' inventions was a closed, cyclical effects stage nicknamed the "rolling road": consisting of two or more loops of canvas running at different speeds, this device allowed shots of moving vehicles to be filmed on a static set to make more efficient use of the limited studio space. Airborne aircraft sequences were mounted against a "rolling sky", with smoke fanned across to simulate passing clouds. One of Meddings' first tasks was to shoot stock footage of the Thunderbird machines and the series' main locations, Tracy Island and Creighton-Ward Mansion. The finished island model was a composite of more than a dozen smaller sets that could be detached from