You have a personal dimension the size of Earth. Outside the planet is enough space to fit a moon or two, then an invisible barrier that cannot be expanded. You have complete and total control in the dimension, even able to create life. You can't take anything out of the dimension, but you can bring anything or anyone in. You can't take anything with you, but any experiences or changes that take place to you are real - including and not limited to death, so don't accidentally die. Time between the Imaginarium and real-life passes at whatever ratio you desire.