Let's say I spend some time drawing this picture:

And after a few paragraphs I want to draw the same picture plus some "spices".
Of course I could just copy-and-paste the code, then edit the few things I want to change. But this turn the LaTeX code messy, as my figure repeats over and over!
Question
How could I use the previous code of a tikzpicture without copying it over and over?
NOTE: There is no caption!