Hello! The schematic screenshot is a simple edited screenshot.
- I did an image capture of the Twine edit window with the smallest passage box size setting (my Twine is set to "dark mode" to have a dark background and spare my eyes) using the integrated capture tool from MS-Windows.
- I pasted it in Photoshop, and added colors, contours and text to show my Twine story structure.
I guess colored passage boxes would be a great addition to Twine - I just do it by hand in a bitmap image editor :D