Ib Penick was the paper engineer of numerous pop-up books for the Children's Television Workshop. Penick also engineered pop-up books featuring Star Wars, Superman and Popeye, as well as Edward Gorey's book The Dwindling Party.
His Sesame and Muppet work includes:
- The Alphabet Book (1971)
- The Counting Book (1971)
- In and Out (1971)
- How Many Elephants Are There? (1972)
- What Happens Next? (1972)
- Can You Find What's Missing? (1974)
- Who are the People in Your Neighborhood? (1974)
- Cookie Monster, Where Are You? (1976)
- The Sesame Street Mother Goose (1976)
- The Sesame Street Riddle Book (1977)
- Grover's Super Surprise Book (1978)
- Big Bird's Rhyming Book (1979)
- The Count's Counting Book (1980)
- Bert and Ernie On the Go (1981)
- Muppet Show Pop-Up Book (1984)