Simplicity is a form of art...

The three additional layers in the OSI model
by Sven Vermeulen, post on Wed 09 June 2021

At my workplace, I jokingly refer to the three extra layers on top of the OSI network model as a way to describe the difficulties of discussions or cases. These three additional layers are Financial Layer, Politics Layer and Religion Layer, and the idea is that the higher up you go, the more challenging discussions will be.