Keith also started showing his work in art galleries, where many people started to buy them.

"I wanted to sell my paintings because it would enable me to quit my job, whether as a cook or delivering house plants or whatever else I was doing--and paint full time."

In his first show in New York, he painted all the walls with his art, and then put up his paintings and his sculptures. Hundreds of people came to the opening party, and it was a big success.

Now Keith worked harder than ever, and he travelled around the world to show his work. He had shows in Europe, Japan, and all across the United States. He even painted the entire side of a church in Italy!

His paintings and sculptures became very expensive. He wanted everyone to be able to buy his work, so he opened a new store called the Pop Shop to sell his art on posters, buttons, T-shirts, and games.

He also worked with children in schools to paint large murals with them, and he made paintings and sculptures for schools and hospitals in many places.

In 1988, Keith got very sick with a disease called AIDS. At that time, doctors could not help people with AIDS. Keith knew he was going to die, but he was very brave and kept working as hard as he could until the end. He also made posters to tell people about the sickness and gave money for doctors to search for a cure.

After Keith died, his work still lived. You can find it in museums, in books, on posters, on TV -- and now even here on the World Wide Web.

Keith wanted everyone to make art, especially children.