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Am I correct in thinking that diagrams have something like a "program-mode" part and a "normal-mode" part? From a new diagram, if I place some objects in normal mode and then switch to program mode, there's no textual representation of those objects.

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In your scenario, the way to gain access to the objects you created in normal mode (e.g. to modify their properties) is by using the `Layer:getObject()` method to retrieve objects by their index. You can see an example in the "Modifying Existing Drawing Elements" in the program mode section of the user guide: https://www.vexlio.com/user-guide/#program-mode

I think it would be nice if, when drawing shapes, it would generate the Lua code and the program mode text would persist when switching between modes. I definitely realize that would be quite the task.

So it's more that Program mode is an imperative means to add objects to the diagram, and switching between modes commits those changes?

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