It was the first step to leave the dusty, static art which we have known from the art marked. The movement, the process can be an essential part of the sculptures.
After I start to build kinetic sculptural and machines, electricity become also a very important part. Electricity allowed the sculptures moving permanently, or when you want. After the mechanical switches, which are contolling the objects, electronic curcuits become part of the sculptures, that gave more possibilities to interact with the sculpures.
Without electricity, it was mainly mechanical watch mechanics which are making movements possible