There is no such thing as a "fushigi ball". It's possible you're thinking of a different type of toy or object.

Could you please provide more context or details about what you're referring to? For example:

* What is the purpose of the fushigi ball?

* Where did you hear about it?

* What does it look like?

Once I have more information, I can try to help you understand why it might not be safe to put it in the sunlight.