From the publisher:

The ultimate gift for Muppet lovers everywhere, this extraordinary tribute celebrates 40 years of Henson's creative genius--from his best-known inventions to his lesser known but equally fascinating notions for everything from designs for futuristic nightclubs and homes to experimental films. 500 color illustrations.

This came from the library of Burny Mattinson (1935-2023), an animator, director, producer, and story artist for Walt Disney Animation Studios, from 1953 until his death in 2023. Mattinson directed Mickey's Christmas Carol and The Great Mouse Detective. He was named a Disney Legend in 2008 and was the longest serving employee of The Walt Disney Company, with a career that spanned almost 70 years. His extensive library included numerous subjects and especially large collections of books on Disney, animation, and classic comic strips.