You know what dreams are?
They are undigested thoughts, that People have.
And your subconscious mind, simply looks at a table of these "thoughts" which you can or did have at
any given time in your life, and plays a game of, lets say,
"Pick up Sticks" randomly with these thoughts in order to keep you alive during sleep. Other wise you would die. Likely...
Now a re occurring dream, thats where there is one "Stick" that's always around in your head, Somewhere.. And your mind just chooses it, cause it is easy to get to, or that you are subconsciously
thinking about it.
This, however can be a bad thing, if the "Stick" that is closest to access for the Subconscious, is a Bad one. (which yours doesn't seem to be)
Say like... For me, its a fear of being underwater and not being able to see far, and there are "Objects"
under the water, near by. I have re occurring dreams of stuff like that.
Only YOU, know why or where, this
"Picture" thought of yours, came from.
Ask yourself.
Best of luck.
---
Wanna know what Uranium smells like?... You not need travel very far..
https://www.youtube.com/watch?v=YzbvTvlErE0