With over 100 interactive diagrams (all created with Geometry Expressions), this is the essential edition of Euclid's Elements for the digital age.
The following iBooks contain interactive examples that were exported from Geometry Expressions v3.0 as OS X Dashboard Widgets and imported by the iBooks Author application.
They will automatically appear in your iBooks collection when you download them to your iPad.
A short article on circle caustics in the form of an iBook with interactive elements.
A chapter from a forthcoming iBook entitled "Interactive Calculus".
A chapter from the iBook "Learning Calculus with Geometry Expressions".
The complete book is available in the iTunes Store