Task 4:

Imagine you have to explain the object in the image below to

–        a child in a kindergarten group;

–        a student of an eighth grade school group;

–        a head technician from a engineering factory;

–        a female, retired junior school teacher.

Old, rusty set of  cog wheels in a glass case.

4.32. picture: Two cog wheels with peculiar shapes that set each other in motion. Istituto e Museo di Storia della Scienza, Florence. (Photo: Tamás Vásárhelyi.)