Hello @mayara,
Welcome.
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You did not format your code correctly.
What is the source of this code?
Hints only:
- reference | p5.js < Add some color with opacity to the sphere.
- Remove the background()
- Make the sphere larger and remove the stroke.
- Add the end of draw() overlay the the entire sketch window with a rect() that is black and also has opacity.
Experiment a little with above to achieve desired results.
I did the above to achieve this:
It looks much better live than in a screen grab.
:)