I have heard of you. I had an account previously but due to some circumstances I had to create a new one. But the emotion detector... this is the first time I have heard of it.
I never liked the diagram of Question 6a of the 1993 4U paper... hahaha. Not really sure about crazy diagrams... there is a past paper question from one year somewhere that I also didn't like...
It's all about being able to visualise what you're trying to find the volume of, which is what I struggled with. Once you can do that, it comes pretty easy!
Took me ages to get in to it because I was always so bad at it! By the time the HSC came around though I was actually quite good. Haven't done any in ages though >.<