Last Thursdayism

Last Thursdayism is the idea that the universe was created last Thursday, but with the physical appearance of being billions of years old. It’s also a counter to the creationism theory. Under Last Thursdayism, books, fossils, light already on the way from distant stars, and literally everything (including your memories of the time before last Thursday) were all formed at the time of creation (last Thursday) in a state such that they appear much older.