Send messages from one object to another.
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(1) Add a new object, e.g. Alice, which should send a broadcast message. Additionally, add a second background to the background's looks. As soon as the background receives the broadcast message it will change to its other look.
(2) Insert the brick „Send to all“ and determine what should happen when the other object receives the message.
(3) In this case the background changes when the object in the front layer is tapped.