Common Law: Traditional "Mirror Image" Rule. The traditional contract law rule is that an acceptance must be the mirror image of the offer.This mandamus proceeding arises out of a suit in the Wayne county circuit court, in chancery, entitled Jean Tong and Oscar Tong v. Grover C. Ake and Ada O. 2 In short, the parties' contract may be memorialized in writing if there is an offer and an acceptance. O ROLLING CONTRACT FORMATION. 2. Read Contract Design Grp. Access the forms and information you need to file or respond to a small claims case. "Acceptance" is the unequivocal agreement to the terms of the offer, establishing a contract.