Celebrate Public Domain Day with Betty Boop and Piet Mondrian

"The Little Engine That Could," a Salvador Dalí and Luis Buñuel collaboration, and many other works are now free to use and reuse.

Celebrate Public Domain Day with Betty Boop and Piet Mondrian
Piet Mondrian, “Composition with Red, Blue, and Yellow” (1930) (image via Wikimedia Commons; all images public domain)