Folding mirrors can either reflect vertically or in reverse, as mirrors do.
The vertical reflecting, where the words mirror in a linear fashion, rather than reversing, is known as specular and an example of this is Sarah James’ Left to Right.
With the reverse folding mirrors the words do not go backwards, as with the real mirror reflections (see image). Instead, words reverse in their placement on their respective lines.
The poem/diagram below is a simple example of how words can be placed in opposite places in either half of a poem to create a reverse mirror effect.
-Black Brown Grey White-
–Blue Green Yellow–
–Yellow Green Blue–
-White Grey Brown Black-