Private vs Public Design

Some thing I realized: all design is social. There is a certain sociology of design, which means there is some types of designs which are created for impressing others (public design) then there is design which is designed for your own private enjoyment.

For example, would you desire a Lamborghini with the infamous Lamborghini scissor doors if there was no one else to witness it? Would you enjoy it for your own private enjoyment? Or do you only get joy from stunting or flexing in front of others?

Same goes with designing your body. For example, do you want impressive muscles so you can flex in front of yourself in the mirror before taking a shower naked, for your own enjoyment? Or do you want big muscles to impress others?