the difference between public space and intimity

we can divide the world in two space, the space of intimity and the space of the public. Around of these words people develop artifact with specific features.

For that we use transparent material or opaque material to define our space of live.

Transparent artifact allow to see trough so the space of the intimity is invaded, like a window in a house, where people can see what happen inside and on the contrary i can see what is happening in the world.

Opaque materials instead are used to define closed spaces where there is no sharing of information.

During the passing of the time items sometimes chenged they character for a best usability or adapting to human need