To whet your appetite and keep your writing fingers limber, take a good look at the photo, or let a prompt settle in your mind. Set a timer for a reasonable amount of time, be that five, fifteen, or thirty minutes. Then start writing.
Your character looks through a magical pair of binoculars and sees something other than his own world. What does he find? How might he travel there?
Write about a time when you could see a great distance with binoculars or not. How can you take that perspective and look back on your life?
Write about the invention of telescopes and how they work.