How to replicate effect of the see through window

Hey guys I’m trying to understand how this effect is build:
https://webflow.com/blog/10-brutalist-websites
Specifically the first image that is revealed by a window when page is scrolled.
I examined the code and its not exactly straight forward, something do with transform relationship.

Could you please point me in the right direction?

Cheers!


Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Fixed background image. More info here Backgrounds | Webflow University

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