How does the Bayesian Bar relate to Bayes Theorem?

In this video I explain how the Bayesian Bar relates to Bayes Theorem. If you haven't already done so, I recommend you first watch the video 'How to Think About Probability Visually - The Bayesian Bar' first, as it will help you to understand this one.

https://www.youtube.com/watch?v=RNQeOJoeiW0&t=9s

This video employs as an example a probabilistic version of the Fine-Tuning argument for Theism. If you want to learn more about this argument, as I don't really discuss it, then have a look at two great papers by John Hawthorne and Yoaav Isaacs:

Fine-Tuning Fine-Tuning -
https://www.yoaavisaacs.com/uploads/6/9/2/0/69204575/ms_for_fine-tuning_fine-tuning.pdf

Misapprehensions About the Fine-Tuning Argument -
https://www.yoaavisaacs.com/uploads/6/9/2/0/69204575/misapprehensions_about_fine-tuning-1.doc.pdf

Видео How does the Bayesian Bar relate to Bayes Theorem? канала Thinking illustrated