 Time-travel does not require that entities are four-dimensional (2012b, 337). If a single dancer, then, time travels to the past to dance with herself, this does not amount to one temporal part of her dancing with a different temporal part of her. If that were so, neither dancer would be identical to the (whole, temporally extended) woman. But Leftow supposes that both would be identical to her, and so would not be merely her temporal parts. He holds that if time travel is possible, a self may have multiple instances or iterations at a time. His theory is that the Trinity is like this, subtracting out the time dimension. God, in timeless eternity, lives out three lives, or we might say exists in three aspects. In one he’s Father, in another Son, and in another the Holy Spirit. But they are all one self, one God, as it were three times repeated or multiplied.