Lugs are artistic, and over the years there have been hundreds of styles, some proprietary, some generic, some plain, some intricate, many just plain beautiful.
All lugs are interesting.
When you look at a frame joint formed with lugs, there's something to look at. There's a lot of good in lugs, and lugs used to be the preferred way to build fine bicycle frames. It is a strong way to join tubes. It is efficient. It's even excellent.