I just answered this to say LOL at the first link. And that tattoo would annoy me tbh. It's too small and the spine it s pretty important location, pivotal in fact. Your spine is the core to your being, I don't think any poem could take that location and be "aesthetic". Why would you have the words oriented one way, and not the other? The asymmetry would just bug the hell out of me as well as the tiny font and ESPECIALLY if it didn't fit in one line...don't even get me started on a sideways paragraph!
I clicked the first link before I read your post, imagne my surprise when I see a bunch of birds! They're nice birds, but I don't think they would make a good tattoo!
As for your REAL question, I'm not sure that I like it. The font is just so small, it kind of just looks like a string of ink along the spine. And I don't really like the idea of it being sideways, it's too difficult to read. What's the point of having a tattoo if it's impossible to read?!
But yes, I like spinal tattoos, they're really interesting, and won't interfere with anything 'professional' you want to do, like getting a job or whatever, because you can hide it with particular clothing.
My cousin has Chinese symbols all the way down his backbone, which looks really cool :)
It could be interesting...i mean,people would definitely inquire as to what it is saying.Its not something I would get though.I mean if you're getting it for others to read...they might have some difficulty. :/