I love the book length graph but I also think it would be cool to see the pie graph with a toggle to change the expression.

For example currently one 600pg book = 1 value, and one 50pg book = 1 value, but it would be cool to have the option to see it expressed where the 600pg book = 600 value, and the 50pg book = 50 value etc. so even sorted into the current page count categories you could see the specific "amount" of reading you've done in that way. Hope I explained that well enough.