Physical
Bootstrap Paradox
Information or objects exist without ever being created
Overview
A time travel paradox where an item or information is sent to the past, becoming the very item received in the future, with no origin point.
You travel to the past and give Shakespeare a book of his complete works. He copies it and publishes it as his own. But where did the information originate? You got it from Shakespeare, who got it from you. It exists in a causal loop with no creator.