"Lines and Curves" with animations

Russian e-book with buttons for animations
is here:
http://zadachi.mccme.ru/prkr/  , see also an Interesting Illusion: 

Straight Lines and Curves : N. Vasilyev, V. Gutenmacher : Free ...
The authors N. B. Vasilyev and V. L. Gutenmacher are professors of mathematics at Moscow University. N. B. Vasilyev works in the field of the application of...

and the book "Lines and Curves"  in English on Amazon.com: