Detail from a pen plot of Truchet tiles of overlapping, concentric arcs in a large portrait orientation grouping, swirling around the page in primary CMYK inks but mixing to create secondary colors. The detail focuses on a middle showing the individual pen strokes of the arcs in a multitude of colors.
https://files.mastodon.social/media_attachments/files/112/570/266/241/849/191/original/6a9f8dbf9afae976.jpeg