physicsfun on Instagram: "Iridescent Dual Spiral: another fun 3D print with dual spiraling motion this time using tricolor iridescent silk filament that produces a color changing effect. More kinetic art from RJ Design. ➡️ Follow the link in my profile for info on where to get this inexpensive kinetic art (or the stl files) and many other amazing items featured here on @physicsfun #helix #kineticart #physicstoy #illusion #spinner"