I wrote simple learning programs along these lines in C and Java in the 1990s. I didn't have a web page to publish my progress on then, but once I got to the po

I wrote simple learning programs along these lines in C and Java in the 1990s. I didn't have a web page to publish my progress on then, but once I got to the point of being able to create ANY graphics in Java, I can readily imagine myself moving from that to the bouncing ball sort of thing in a day of concentrated effort. So that alone doesn't suggest to me anything deceptive afoot. I doubt my indentation patterns were very consistent at first either. :-) Especially if I was learning from one book on one day and another book on another day.