Me, Myself, Good

We bought this piece of art made by Michael the gorilla titled "Me, Myself, Good" at an estate sale last weekend. They actually told me that it was a Koko piece so I was a little disappointed to find out that it was a Michael piece. I am familiar with Koko but who is Michael?

From Koko.org- "Michael was the male gorilla who was raised with Koko and communicated using over 500 modified American Sign Language gestures."
Michael died unexpectedly of heart disease in April of 2000.
"Michael's powerful self-portrait which he signed with his own handprint. If you look closely at the colorful shape to the left of the handprint, you may see a profile of Michael sitting, as one autistic student observed."