'23kpc' Chapter 4: Crosshatching the Background

...when the foreground goes temporarily out of focus

[Image: “Reading table, restaurant at the hotel new york,” original photo by Michael Edson found on Flickr and used here — slightly remixed — under a generous Creative Commons license. Thank you!]

No idea what this is about? You might want to start at the preceding two posts in this series, here and here, before moving on.

What you know so far: Chapters 1…