Photo borrowed from Drillium Revival
Over the years, people have attempted to create the lightest bicycle components possible by drilling and milling components and frames. Sometimes this ends badly, as the structural integrity suffers. Other times, it is simply awesome art. This guy is GOOD. He currently has a seat post on eBay that's going for a reasonable amount, considering time he put into modifying it. Click HERE to view his gallery on Flickr.
Many purists scoff at modifications such as these. What do you think?