Trigonometry exercise book

During my later high school years I started using exercise books that I would bind myself from blank papers. the front page, therefore, would always a white blank page with my name and subject name written in the top corner. That white blank titillated me into drawing something. Here is an example from one of those covers. Sadly I lost almost all of them while moving from hostel to hostel.

The cover of my 12th Standard second Trigonometry exercise book. I used to find nice quotes to write on my notebooks then.