Siemens graphic user interface custom icons a challenge. (There were a lot!)
The Siemens corporation needed software interface icons for their Windows application which controls HVAC for large office building or arrays of buildings. Design Design read through pages of descriptors about the function and meaning of each before executing over 80 different pieces of art. The challenge was then to make sure each icon worked at a 48pixel size as well as reducing down to the elusive 16 pixel toolbar miniature.
All the icons were produced as .eps files as well as Windows .ico files. (Yes, we are all Mac, so that was a bit tricky.)