A controller (5) for controlling a controllable device (31-33) is configured to determine one or more characteristics of a set of received radio frequency signals, detect interaction with a physical control device (36,37) by a user, determine, based on the characteristics of the set of received radio frequency signals, a shape of a hand (91) which is holding or touching the physical control device and/or a manner in which the user is using the physical control device, perform person identification based on the hand shape and/or based on the manner of using the physical control device, and control the controllable device based on the interaction in dependence on a result of the person identification.
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