Tie a pen to the end of a thread wound clockwise around a spool. Pull the thread taut and move the pen counterclockwise to unwind the thread. The pen traces a curve approximated by an Archimedean spiral: The distance from the pen to the center of the spool is nearly proportional to the change in angle made by the thread relative to horizontal.
Created from high-quality wood, milled with simple clean lines and presented with a satin finish. Includes an off-white mount that will not discolour or fade with age. - Simple, elegant design - Premium, fine art paper with a gently textured surface - Handmade by specialist picture framers - FSC certified off-white mat / window mount - Delivered ready for hanging
