Why was it that the word mill — and not some other word — was selected to denote the first textile factories? There must have been some connection between the former sense of mill and the new phenomenon to which it was applied. And there was apparently such a connection. Mills which produced flour, were mainly driven by water. The textile factories also firstly used water power. So, in general terms, the meanings of mill, both the old and the new one, could be defined as "an establishment using water power to produce certain goods". Thus, the first textile factories were easily associated with mills producing flour, and the new meaning of mill appeared due to this association. In actual fact, all cases of development or change of meaning are based on some association. In the history of the word carriage, the new travelling conveyance was also naturally associated in people's minds with the old one: horse-drawn vehicle > part of a railway train. Both these objects were related to the idea of travelling. The job of both, the horse-drawn carriage and the railway carriage, is the same: to carry passengers on a journey. So the association was logically well-founded.
Stalls and box formed their meanings in which they denoted parts of the theatre on the basis of a different type of association. The meaning of the word box "a small separate enclosure forming a part of the theatre" developed on the basis of its former meaning "a rectangular container used for packing or storing things". The two objects became associated in the speakers' minds because boxes in the earliest English theatres really resembled packing cases. They were enclosed on all sides and heavily curtained even on the side facing the audience so as to conceal the privileged spectators occupying them from curious or insolent stares.
The association on which the theatrical meaning of stalls was based is even more curious. The original meaning was "compartments in stables or sheds for the