Dominoes and Butterflies

With schools set to start soon, your stomach may be craving pizza. Or, you might be nervous. Probably neither, I just wanted to play with the title of this issue. The theme is actually more scholarly. Test your knowledge of philosophy with the Dominoes and Butterflies puzzle. Afterwards, relax with some variety puzzles which may or may not have anything to do with dominoes and butterflies.
Have fun!