Communication by means of electricity

The interactive communication concept of telephony shows the evolution of telephone devices from their beginnings to the most current communication solution. One device at a time is presented here as representative of a defined period.
According to the progress in technology and production, the cases differ in form, as well as in the installed technology. The respective differences of the technology, which surrounds us today everyday, are compared with one another in the concept presented here. In the process, information can be examined in a playful manner, and insights into the functionality of the individual devices can be gained.