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In the beginning, I didn't have a complete picture of the storyline. But I did know what I wanted the game design to be. I try to match the game design with the storyline, so the story followed from the mechanics. (At an industry conference recently, Ueda was asked why Ico, the main character of the first game, had horns on his head. The designer said that in early play tests it was difficult to tell which character you were controlling, so they put horns on his head. Only after that did it become part of the game's story.)