an analogy used in teaching
"There are many teaching analogies which are in common use, such as considering the nucleus of a cell to be like the brain…, or the camera to be like the eye… or considering the change of direction of light when it moves between materials with different refractive indices to be akin to a vehicle or marching band passing from a tarmacadam surface to a gravelled area…" (Taber, 2013, p.1380)
