A transaction system including at least two transaction communicators, at least one of which is a mobile communicator, at least one of the at least two transaction communicators having sequential visually sensible indicia generation functionality operative to generate a time sequence of indicia which provides at least transaction data and at least one of the at least two transaction communicators having sequential visually sensible indicia receiving functionality and transaction data extraction functionality capable of extracting at least the transaction data from the time sequence of particular indicia, whereby a time sequence of indicia which provides at least transaction data is transmitted from one of the at least two transaction communicators to another of the at least two transaction communicators.