Design started back in the cavemen times. When society first began, design was born out of the need to get it to function and make it easier for people to carry out tasks. Be it for cooking and rituals, where pottery was needed, to transportation, where wheels were invented, to mysterious structures like the Stonehenge, people had to refine design decisions to get society functioning more efficiently.

 

Resource:

https://en.wikipedia.org/wiki/Neolithic_architecture