What are examples of juxtaposition in poetry?

The Japanese haiku (as distinct from non-Japanese
variations on the Japanese philosophy of haiku) embodies juxtaposition of nature with
human activity with the objective of revealing something about human nature.
Juxtaposition can be defined as the arrangement of two or more concepts next to each
other to produce a strong affect. Revealing something about human nature by arranging
nature and human activity produces just such a strong affect. Sonnets also employ
juxtaposition. For instance, Shakespeare's Sonnet 29 juxtaposes misery and envy with
lark's songs to reveal something about the nature of love.