This is my second participation for the Meme Challenge #287 hosted by @fibra59, thanks to him.
You can find the rules and the last winners in this post, and you should participate too:
If Galileo inspired Newton in his research, we must not forget that the crystal ball was his main source of inspiration.
We can see in this painting that the globe is entirely blue and glowing, which is a subtle way of referring to the occult sciences without really representing them, which would have been unacceptable at the time.
This is my own interpretation, Wikipedia is innocent in this case.