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Instead of printing text, your program can tell you about its state by generating a picture! Or playing sounds at key moments!
Some ways your programs can generate pictures or sounds: - add colours to your log lines (every letter of ‘colours’ is a different colour) - add red outlines around every HTML element! (“red” and “outlines” have a red outline around them) - Haskell has an option to beep at the start of every major garbage collection (there’s a bell icon after “beep”) - draw a chart of events over time (chart icon) - use graphviz to generate a diagram of your program’s internal state (there’s a picture of a little graph diagram with a -> b, a -> c)