The Open Daybook is a calendar/journal/sketchbook. 365 artists contributed to the book, each creating a work of art for his/her assigned day of the year. The rest of the page is left blank, inviting the owner to contribute notes, sketches, or daily schedules. Because there is no year on the book, it can be used year after year as a perpetual calendar until the owner runs out of space. From the website, "As the owner of the book doodles, plans for the future and records the past, a second book is created, a collaboration in which each artist’s day becomes the owner’s day as well." Nice.