A boy blowing bubbles. Engraving by M. Blot, 1792, after F. van Mieris. https://www.rawpixel.com/image/13983258/boy-blowing-bubbles-engraving-blot-1792-after-van-mierisFree Image from public domain licenseDoorsnede van de Aarde met bellenblazende engel en fles met bubbels (1706) by Sébastien Leclerc I and Pierre François Giffart https://www.rawpixel.com/image/13783837/image-paper-person-artFree Image from public domain license