Collection Two . The Estate
Bill gave this mug to Francis so he would stop taking his own. He stenciled an "F" on it and tried to teach Francis to recognize the symbol, but to Francis the F appeared different every time he looked at it. He didn't recognize it as his own, and still took Bill's mug.
Bill later realized that Francis had put his own signature symbol on all of his own belongings and vision artworks, and so he had Francis draw the symbol on this mug (see 2nd photo). From then on, Francis took the mug as his own and used it.