To start the program, first click on the man on the left.
Then click on the sphere. When the yellow cube pops up, click on that.
This is the section of Galileo in which this scene is found: Andrea, as in a trance has gone to the globe. He lifts the upper half and gets the book. He turns the pages as if wanting to devour them. In the background the opening sentences of the Discorsi appear:
My purpose is to set forth a very new science dealing with a very ancient subject--motion...and I have discovered by experiment some properties of it which are worth knowing...