From the Wikipedia page on Sestinas, there's a link to one of the most gorgeous pieces of mathematical poetry I have ever run across.
EVEN if you are not mathematically inclined, trust us, you still want to read this:
S{e,s,t,i,n,a}
EVEN if you are not mathematically inclined, trust us, you still want to read this:
S{e,s,t,i,n,a}