I saw something like this described many years ago (possibly by Ted Nelson, who coined the term 'hypertext'). The concept was like a volume control for text whe

I saw something like this described many years ago (possibly by Ted Nelson, who coined the term 'hypertext'). The concept was like a volume control for text where cranking the volume control varied the amount of detail from one line summary through to a multi page article. I've always really liked the idea but writing coherent content could be fiendishly difficult (the simple approach is just to provide a number of versions and cycle through them).