Ada does not express herself through language. She communicates to her surroundings through sounds, light signs and projections on the walls. By illuminating a floor plate, for example, she can let a visitor know she is aware of his presence. She can invite him to follow her light signals. If the visitor reacts to this, he arouses Ada’s interest and she tries to intensify the "contact” by following his path with a spotlight and directing her artificial eyes toward him and projecting these images on the wall. The use of the skin as an expressive communications organ is something we know from the animal kingdom, such as with the octopus or chameleon.

Ada can also express herself through music. The music is produced by a so-called Roboser. The Roboser composes and generates its music based on the data that Ada receives from the environment (sensory input), and the internal state associated with it. It is hence a direct expression of Ada’s state at a particular moment.

Light and music not only reflect the state Ada is in at a given moment, such as sleeping, waking up, investigating the environment and playing with visitors, but also allow her to communicate her moods. Ada is thus able to show that she is surprised by something, happy or sad, or feels disturbed.