Quote from ACIM Text Chapter 7, Section 9 - The Extension of the Kingdom.

Your creations are protected for you because the Holy Spirit, Who is in your mind, knows of them and can bring them into your awareness whenever you will let him. They are there as part of your own being, because your fulfillment includes them. The creations of every Son of God are yours, since every creation belongs to everyone, being created for the Sonship as a whole.