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Duel Spirits have played a pivotal role in human history dating back at least ten thousand years. Humans somehow found a way to summon them here the human world using magic and spells. The Ancient Egyptians sealed their spirits (or the means to summon them) in stone tablets by ripping a person's Ba from them, killing them in the process. These tablets resembled duel monsters cards and later inspired [[Maximillion Pegasus]] to create the game. In doing so, Pegasus sealed the duel spirits (or means to summon them) in the cards, similar to how they were sealed in the tablets. However, they are only truly summoned when magic forces are involved or when they are involved with certain individuals. Otherwise, they are merely represented by holograms projected by [[KaibaCorp]] technology. Therefore while they have true physical form in their own world, they cannot take physical form on Earth without being summoned here. [[Duel Monster Monsters Spirit Day]] is an exception however being the only day of the year when Duel Spirits can take physical form on Earth without elements of magic being involved.