Lucifer considered and shrugged. "He is enjoying the concept of it existing and not the fact that it does exist. The cookie does not need to be here for your brother to do math. That is a major purpose for mathematics, theoretical exploration."

Lucifer leaned on the side of the cookie and looks to Isamu. "I indulge in the theoretical but you should make sure it does not isolate you from the rest of existence when you continue to choose thought over what is before you. Long ago, I went down that path and it had detrimental consequences for many beyond myself."