Use arrow keys to move the camera or activate the joystick from the menu.
You can zoom from the menu or press keyboard keys "Q" and "A".
To change the number of pieces select the horizontal and vertical amount from the menu and then press "Create".
The Star of Bethlehem, Edward Burne-Jones
Netherlandish Proverbs, Pieter Bruegel the Elder
The Calling of the Apostles Peter and Andrew, Duccio