The third book in the Ludwig series, sees our hero traveling through time, all the way back to the dinosaurs. As with all Ludwig books, it is an adventure in another dimension, 3D glasses included.

Ludwig receives a parcel, an egg which he has to take back...

...so he starts his research and jumps in a book, "the entire history of the world" traveling through time...

...arriving at the time of the dinosaurs (another big fold out in 3D)...

...and inventing the wheel on the way :)