A Babylonian invocation to Marduk may empower magick strengthening law and order, but would seriously disrupt any entropy magick. Birds feathers stuck to your broom might make it fly etc. This can be used to empower magick and encourage roleplaying. Just waving a pentagram in the air to summon lightening is not as efficient as throwing it to the ground, and a mage wishing to hurt someone using Life may stab his footprint. Things once in contact continue to interact after separation.
Emphasis is on objects or people that have been in physical contact.
An example of the combination of the above 2 laws would be a voodoo curse of someone. Bonewits states that the Laws of Association are the most commonly used. Quite obviously applicable to mage. An example of this in a FRP context is avatars, priests etc. of a god. When it is only a temporary identification this is possession.