Talk to a partner in a whisper, even though he's several meters away?
This is no problem with the two opposing listening mirrors, which look like large parabolic antennas. Each person stands in front of a listening mirror and speaks quietly from a short distance.
Further informationson the exhibit "Auditory path"
Sound is reflected by smooth surfaces. Like a ball thrown against a wall, the angle at which it hits the surface is the same as the angle at which it is reflected. If the surface is not straight, but circular or parabolic, sound waves arriving in parallel are reflected in such a way that they all meet in one point. This point can be found by careful experimentation: It is the point at which you understand your partner particularly well.