Analogies

[jcat93]

Bird:nest
  Ink:pen
   Card:envelope
      Book:page
        Dog:cat
           Birds:bees
What's the point of all these?

Bird in a nest,
  Ink in a pen,
   Card put in an envelope,
      Book without a page,
        Dog is opposite of cat,
           Bird opposite of bees,
Why must we learn all these?