How to use "worlds" in a sentence

His ships, sealed in their glass worlds, relaxed him; he liked to spend time with them when he had a problem to work out or when he was on edge, for they made him feel serene, and that security allowed his mind to function at peak performance.

Part of this antagonism between them rose because they had been born into utterly different worlds and were equally proud of their origins - as well as disdainful of all others

They knew that the worlds of domestic military security and international espionage were not children's playgrounds

Upon my word, Watson, there is something very attractive about that yellow face at the window, and I would not miss this case for worlds.'