In a mirror reel, two groups of dancers are separately performing reels, usually on the sides. The only significant difference from an ordinary reel is that there is symmetry about a line through the middle of the dance. Typically, the second couple face up and the first couple face down, with the men performing a right shoulder reel and the ladies performing a left shoulder reel. This means that the first couple are moving towards each other at the start of the figure. They may touch hands as they do so.
The diagram below shows the direction of the dancers; for a detailed explanation of how the reels themselves progress, see the reel of three description.