In 1907, the Parker Pen Company introduced the 'Parker Jack-Knife Safety' fountain pen, which featured a simple and reliable self-filling mechanism. Instead of using a dropper or a separate filling system, this pen could be filled by operating a lever on the side of the barrel. This made the fountain pen much cleaner and easier to use, contributing to its widespread popularity.

The self-filling fountain pen was a major step forward in convenience for writers. It eliminated the need for a separate inkwell and the mess of filling pens by hand. This innovation made the fountain pen even more practical for daily use, encouraging poets to write on the go and without interruption. The ease of filling also meant that writers could change ink colors more frequently, adding a new dimension to the materiality of their craft.