Thank you, but this not working as my image example above.
Look, to understand. Let's say we create 10 boxes. So, we have:
First Creation: 1 => Opacity: 100
______Creation: 2 => Opacity: 100
______Creation: 3 => Opacity: 100
______Creation: 4 => Opacity: 100
______Creation: 5 => Opacity: 100
______Creation: 6 => Opacity: 100
______Creation: 7 => Opacity: 100
______Creation: 8 => Opacity: 70
______Creation: 9 => Opacity: 40
Last Creation: 10 => Opacity: 10
Something like this. Of course, what extra need is to have creations depend distance. But again, thanks for your help! :)