In Euclidean Geometry, objects retain their size and shape during rigid motions (also called symmetries); one of these is translation -- movement of an object from one place to another along a straight line path. Here are a few lines by Alberta poet Alice Major that explore the paths of rhyme as a sound moves to and fro within a poem :
Rhyme's tiles slide
to line, a not-so-rigid motion --
a knitted, shifting symmetry
that matches 'tree'
to 'infinity', 'identity'
or 'melody.' Rhyme bides
until a tuneful congruence
chimes in --
with a difference, like forests
that line a river with the glide
and aspen, an automorphic chorus
These words from Major are the closing lines of a paper, "Tune and rhyme: Translation symmetry at work," presented by the poet at the 2012 Bridges Conference (Session I-7) in Towson, MD. Major also participated in a poetry reading at that conference. Bridges 2013 will be held in the Netherlands.