Computer-generated imagery
Derrickson emphasized a Trinity-like relationship between the sphere, Klaatu, and Gort. Klaatu is initially depicted as a radiant focus of sentient light. He is then depicted as a gray "walking womb" shape which finally takes on a completely human appearance. The filmmakers conceived the transitional form because they pondered the idea of humans mistaking space suits for alien skin. Computer-generated imagery and practical effects achieved the transformation. Todd Masters ("Slither") directed the creation of the alien form, using thermal plastic and silicone.