In William Sleator's 'The Green Futures of Tycho,' 11-year-old Tycho Tithonus discovers an ancient, egg-shaped object that allows him to travel through time. Initially using it for mischief with his siblings, Tycho soon witnesses disturbing future versions of himself and his family, where his actions lead to increasingly dire outcomes. The book delves into themes of personal responsibility, the impact of choices, and the courage it takes to alter a predetermined path. It's a suspenseful science fiction tale that encourages readers to consider the long-term effects of their behavior.
When he finds an ancient, egg-shaped object with which he travels back and forth in time, eleven-year-old Tycho grapples with several terrible futures he sees for himself and his family.