https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8231826![Flip Glass (ca.1938) by John Dana.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDIyLTEwL2ZsaXBfZ2xhc3NfMTk0My44LjExMTgyLmpwZw.jpg)
![Flip Glass (ca.1938) by John Dana.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDIyLTEwL2ZsaXBfZ2xhc3NfMTk0My44LjExMTgyLmpwZw.jpg)
Flip Glass (ca.1938) by John Dana.
Flip Glass (ca.1938) by John Dana.
Original public domain image from National Gallery of Art
Public DomainFree CC0 image for Personal and Business use