What is a guilloche?

A guilloche is a decorative pattern created through intricate, interlacing designs, often resembling waves or spirals. It is commonly used in graphic design, engraving, and printing, particularly in the context of currency and certificates to prevent counterfeiting. The technique involves precise, repetitive movements of a tool, creating a visually appealing texture that enhances the aesthetic value of the material. Historically, guilloche has been applied in various decorative arts, including jewelry and architectural detailing.