The present invention discloses a system and method for changing the state of a user interface (UI) element of a computer program visually marked on a physical object, through a touch action upon the object, among a plurality of objects on the interactive surface, each comprising a capacitance tab and a unique identification code. During runtime execution of the computer program, and in response to a touch action upon an object by an end-user, the interactive surface is configured to detect such touch action upon the object through an embedded capacitance sensor positioned under the object, and direct a sensory accessory to indicate a new state of the UI element marked on an object by exhibiting a new sensory pattern. The present invention offers enhanced interactivity between an end-user and a computer program mediated by physical objects.