Typography Insight is an accessible, affordable iPad app (just $1.99) that sprang from Dong Yoon Park’s master’s thesis.
While at Parsons, Park says he realized that it was difficult for students in introductory typography classes to see the subtle differences between historically important typefaces, especially when viewed on paper.
Park’s app, Typography Insight, makes it easier to see and compare these detailed shapes. The iPad’s interactive nature even lets you manipulate the typefaces.
For a deep dive into Park’s ideas, read his master’s thesis in PDF form.
This is a brilliant execution of a simple idea, how to teach typography. His thesis is interesting.
For further study “The Elements of Typographic Style” by Robert Bringhurst is a must-read.