"There's the one that holds up the clouds, and beyond that one that holds up the moon, and beyond that one that holds up the sun, and beyond that one for all the stars. You can see them, if you look for them. Up there, where the stars are appearing, that's the next sphere. That's the dome of the stars. Then there's the dome of the night. Beyond the dome of night you reach the dome of silver-crystal, which is a perfect mirror. After that is the end of space and time, after that is where you enter infinity. The silver-crystal sphere gives such a perfect reflection that you can enter it, and then travel back through the night and the stars, down past the sun and moon and clouds, and find yourself home again."
'The Trial of True Love' By William Nicholson