clearer description of editing experience

README.md

@@ -27,9 +27,17 @@ src/teliva hanoi.tlv
 <img alt='screenshot of Teliva running the Towers of Hanoi' src='doc/hanoi.png'>
 
 No matter what app you run, you are always guaranteed access to a single
-obvious, consistent way (currently the hotkey `ctrl-e`) to edit its sources.
-Make a change, hit `ctrl-e` again, and the app will run with your updates.
-([video](https://archive.org/details/akkartik-2021-11-14))
+obvious, consistent way (currently the hotkey `ctrl-e`) to inspect its
+sources.
+
+When you look under the hood of an app, the first thing you see is a
+_big-picture view_ which shows the app's major data structures and a top-down
+view of the app's code.
+
+<img alt='screenshot of big-picture view for the Towers of Hanoi' src='doc/hanoi-big-picture.png'>
+
+Select a definition, make a change, hit `ctrl-e` again, and the app will run
+with your updates. ([video](https://archive.org/details/akkartik-2021-11-14))
 
 You will need some Unix-like platform with a C compiler and the ncurses and
 openssl libraries. Some possible commands to install them, depending on your

hanoi.tlv

@@ -85,7 +85,7 @@ end]==],
 original]==],
     main = [==[
 function main()
-  curses.assume_default_colors(250, 30)
+  curses.assume_default_colors(250, 139)
   for i=1,7 do
     curses.init_pair(i, 0, i)
   end