Description Perpetual Calendar Large (Black / Red) is a unique design object made for a lifetime. Set the date and month by simply moving the two magnetic balls. First designed for MoMA in 1998 this boldly original calendar can be wall-mounted or used on a desktop. To use simply insert the stand to place the calendar on a desk or hang it on a wall and move the magnetic balls manually to mark the date and month. Designer Gideon Dagan has developed numerous consumer and commercial products including hand-held computers and electronic instruments. His innovative designs have been exhibited in museums around the world.