In the earliest days of the net, GIFs and JPGs for different aspects of this brave new world often made reference to pre-existing technologies and objects. For example, the above GIF shows two letterboxes for email, a virtual reinterpretation of the traditional door flap for letters and parcels. This analogy helped people be more comfortable with the new technology by relating it to things they were already familiar with IRL.
Credits: Vijay Shah, Blingee