The nuclear waste we produce today has to be stored for 100,000 years before it becomes safe for people, animals and nature. That difficult to grasp timescale is the theme for the art project Letter to my dear, where the artist Lennart Grebelius brings the question of our moral responsibility to future generations to the fore. As a part of a bigger art project, the book is a letter to a child of a future generation where the time span of 100,000 years is made physically visible.