Giger’s art deals a lot in cylinders, I’ve noticed. But he applies it with such tone and texture that it feels alien. I think the reason it works so well is because much of our architecture and design is boxed or rectangular in fashion. We have created very few things that are spherical in nature, and they often result looking very alien, or at least foreign.
I wonder what it is about the human mind that causes this, or if it is just simply because we are used to that type of geometry in our every day lives. Perhaps, if we had been more cylindrical in design as a race earlier on, cubes would feel foreign or alien to us.
So bear this in mind: if you want to get a unique look to your stuff, use a lot of circles and spheres (in my opinion). I think a cylindrical computer case would be fantastic, and probably be more heat efficient.