{"product_id":"karel-martens-perpetual-birthday-calendar-dutch-graphic-design","title":"Karel Martens: Perpetual Birthday Calendar","description":"\u003cdiv class=\"product__description rte quick-add-hidden\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eKarel Martens conceived this A3 wall calendar as a prototype in 1968. The design has been unrealized until now — a limited edition publication from Roma Publications. The Perpetual Birthday Calendar is built on a single die-cut shape, repeated across colored card stock, layered until the pattern multiplies into something that couldn't have been predicted from the piece alone. Thirteen sheets, each a different color, each punched to the same geometry. What changes is what's underneath.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003ePerpetual because it isn't year-specific — designed to track birthdays, anniversaries, or any date worth remembering across years.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eKarel Martens for Roma Publications. Made in the Netherlands.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e14 pages · 11.75 × 16.5 in. · softcover · spiral bound with hanging loop\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Idea NL","offers":[{"title":"Default Title","offer_id":51306574741810,"sku":"KM-BirthdayCalendar","price":52.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0551\/1384\/2854\/files\/karel-martens-birthday-calendar-roma-publications_R512-01.jpg?v=1781400126","url":"https:\/\/wmscoshop.com\/products\/karel-martens-perpetual-birthday-calendar-dutch-graphic-design","provider":"Wms\u0026Co.","version":"1.0","type":"link"}