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Most tools, I'd agree with. My socket sets and spanners are pretty plain... But certain things like cars and PCs are such a big part of one's life and just that little bit more than a mere tool. For some, it's the most expensive thing they own, so blinging it up however they see fit is the thing to do.
Rather than hide it away, some do turn it into the centrepiece of their room. For a talented few artisans, it is an actual work of art.
Surely even you can appreciate a few of those insanely awesome custom scratch builds out there?
For those like me, it's something I spend a lot of time around. It's a big black box dumped on my desk. It couldn't be more unobtrusive if it were the Hindenberg!!
Rather than just a boring black box, I want something I look at and see how cool it is. That said, almost all of my pritty pritty lights do have a practical purpose... I've just been a touch more creative with them along the way.