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Can an American explain to me what's with the grooves on PS1 NTSC cases?
The grooves?
The pattern on the left is actually just inside the case, under a clear part of the case. That part is black in the Euro version, but the case looks the same otherwise. (We have cases like that, too.)
Edit: Also, that Japanese one? I'm pretty sure it's the same style, but turned upside down. That's the base of the case. Searching Google, I found a copy on Ebay that shows the front, and that section of the front of the case is clear for that one, too.