Lighthouse

He Guys,

I made this just for practise.
I am trying to learn more about anti aliasing and pixel perfect artwork. I was a bit confused by the term pixel perfect.
When people talk about pixel perfect they are always talking about no decimal values. But I have a few lines in my document that do have that values. Let's take the example of the cottage next to the lighthouse. The width of the roof is 89.44 px and the height 19 px X = 463,28 px Y = 328.5 px. How come I see no blurry line? If I check pixel preview mode I do not see it blurry. Even if I save as PNG and zoom I do not see any blurred lines. Anyone (pixel perfect expert) that can help me? I would love to hear/learn more about it.

Have a nice day! :)