Normally nothing happens. You can add a Lingo script, however, to the image so that it will respond to a button press - for example, by navigating to a certain place in the score. Director can also send messages to itself - for example, a timer can cause actions to happen after a certain amount of time has passed. Lingo and Director have enormous possiblities but not everything is possible. Learning Lingo means learning the range of possibilities it possess, learning the special vocabulary of words it understands, learning the appropriate syntax for expressing your ideas, and learning the logical organization of Lingo and multimedia components necessary to create your events.
Computer languages require absolute precision of expression.
One word misspelled or an extra comma will cause errors and stop your program cold. This inflexibility is one thing that throws many artists in learning the language. Basically all you have to work with in interactive computer media is the user's movement of a mouse and actions on a keyboard. You can manipulate sound, image, and text. Your challenge is within the limited world of a computer system, how can you create events that are conceptually and expressively rich.