Always loved the IRIX Motif and 4dwm aesthetics, and was lucky to have had access to some Indigo machine in school.

Was really impressed by how responsive the file manager was wrt. the immediate appearance of icons for files created from terminal. It also kept track of which folders were open in other windows, giving them different appearance - felt like one was interacting with actual objects.

Tried numerous times to get the same feel on Linux; there used to be a project called 5dwm to recreate the Indigo Magic Desktop experience, I should check if it is still around for additional kick of nostalgia...