How does indirection work in WPF Storyboard?

Question

WPF

Hello! Please explain how item indirection works in Storyboard.TargetProperty .
For example, according to what logic these lines function (how do they differ, and why brackets are put in certain cases):

Storyboard.TargetProperty="Background.Color"
Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)"
Storyboard.TargetProperty="(Background.Color)"

Ps: I read an article from microsoft about freezable objects and storyboards, but didn't understand much.

Answer 1

Answers:
https://coderedirect.com/questions/533715/round-br...
https://stackoverflow.com/questions/3737458/why-do...
Storyboard.TargetProperty="Background.Color"
The program knows this object in advance and will be linked to other code on compilation stage.

Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)"

This is a late static binding, where the properties of the object are indicated in brackets, which will be known to the program after the program has been launched, and at the compilation stage, notes are left that there will be objects of a certain type.
https://metanit.com/sharp/wpf/13.php