Chapter II: Introduction to Designing

But ‘why then publish?’ There are no rewards
  Of fame or profit when the world grows weary.
I ask in turn why do you play at cards?
  Why drink? Why read? To make some hour less dreary.
It occupies me to turn back regards
  On what I've seen or pondered, sad or cheery,
And what I write I cast upon the stream
  To swim or sink. I have had at least my dream.
— Lord Byron (1788–1824), Don Juan, canto XIV

§4   ‘Ruins’ begun

§5   Introducing messages and classes

§6   Actions and reactions

§7   Infix and the debugging verbs