Final answer:
A voodoo doll is a representation of magic that mainly follows the law of similarity, where like affects like, though it also touches on aspects of the law of contagion through maintained connections.
Step-by-step explanation:
A voodoo doll is a good illustration of magic that follows the law of similarity, which is the belief that things that are alike exert a force on each other; a theory of magic. The use of a voodoo doll typically mimics the appearance of a person and is manipulated with the belief that the doll's treatment will affect the person it represents. This draws on the concept of 'sympathetic magic' as coined by Sir James Frazer, which is based on the idea of sympathy or commonality.
The law of similarity is one of two principles of sympathetic magic as described by Frazer. A voodoo doll also somewhat touches on the law of contagion, which posits that things once in contact with a person maintain a connection. However, it is the resemblance and representation that the voodoo doll holds to the person it is meant to affect which highlights the law of similarity as the more significant principle in this context.