List coding

Actual screenshot.

Item types and locations are coded by bullet color hues (folders) and shades of grey (files, consolidated objects).
Object size is coded by font size and darkness (white for GB, dark grey for KB, actual algorithm is tricky :P).
All the numbers are properly aligned to improve readability (decimal separator depends on your preferences, don't point me to it).

Now we have multiple dimensions in a clean, flat list. Voila. And yes, several extra dimensions can be added without breaking anything.