Frank den Os (1965, NL) is a visual artist working primarily with painting and collage. He lives and works in Crozon-sur-Vauvre, rural France.

His practice centres on returning to materials and discovering what can happen through working with them. Fragments of previously painted paper, layers of colour and marks are brought together, covered and reconsidered. Forms and relationships emerge through this process, often becoming apparent only after they have taken shape.

Since 2024, much of his practice has unfolded within A Measure of Days, an ongoing artwork bringing together a daily rhythm of making and paintings developed over longer periods. Each day he makes one small work, called a Day. Together, the accumulating Days form the Field, whose arrangement changes with the spaces in which it appears.

The paintings belong to the same evolving artwork, allowing forms and relationships to develop over days, weeks or months. Each work has its own presence while remaining part of a larger whole. As Days and paintings enter collections, they form the Dispersed Field, extending the work across different places.