The layered and multi-hued patterns in this birthday calendar—made to hang on your wall—are based on a single geometrical composition punched out of colored card stock in multiple directions.

Stripped of specific years and the shifting days of the week, this object functions as a permanent, non-expiring ledger designed to track recurring annual milestones—birthdays, anniversaries, and memories—year after year.

Originally conceived by Karel Martens in 1968, the design has not been produced in a large edition until now.

Designed by Karel Martens

Published by Roma Publications, 2026

Softcover, top spiral binding with hole punch for wall haing, 14 pages, 11.81 × 16.54 inches

ISBN: 978-9-46-446104-6