More seriously, why not give a gift to all? Extrapolate a bit from notices found on individual works (examples abound, often stipulating a public license, but a see classic one, stipulating public domain):
Unless stated otherwise, everything by me, Mike Linksvayer, published anywhere, is hereby placed in the public domain.
Evocation and scalability before equivocation and specification of edge cases and mechanisms to handle them.
Other random acts of kindness, calculated acts generating positive externality, and atavistic art, all welcome.