The Transformers were created with a mix of computer graphics imagery (from Industrial Light & Magic, and Digital Domain) and props (from KNB Effects). The props built include the miniature AllSpark; Optimus Prime's head, chest and foot; Megatron's legs and claws; Barricade's pop-out sensors; Blackout's feet; Bonecrusher's claw; Scorponok's head and tail; a seventeen-foot model of Bumblebee; and a four-foot model of Frenzy (the latter three in life-size).While ILM designed seventy-five percent of the six hundred thirty effects shots in the film, Digital Domain handled the remaining twenty-five percent, which include the Arctic discovery of Megatron, Frenzy's animated head, the machines mutated by the AllSpark, and the Autobots' protoforms.