[Sigia-l] Iconic paradigms

[Listera]

The vast majority of our digital concepts are represented by icons of
physical objects. Sometimes the former is related to the latter by
reasonable inference. Sometimes the relationship is extremely tenuous, if
there's any at all:

Email -> envelop, mailbox
Edit -> pencil
Security -> padlock
Directory -> manila folder
Delete -> trashcan
Video -> film camera silhouette
Copy -> clipboard

Some deviations also:

Burn -> radioactive sign
Refresh -> circular arrows
Internet -> cloud, globe, Earth
Etc.

Has anyone come across a site/collection where icons for digital concepts
were systematically NOT represented by direct reference to physical objects?

---- 
Ziya

Best Practices,
For when you've run out of your own ideas and context.