Why 13x13 tiles?

Hi,
Some brands (e.g. Daltile) have 6x6 and 13x13 tiles, while most others offer 12x12. I'm a little bit confused by their choice of sizes since I imagine 6x6 and 12x12 aligning perfectly (with twice the grout for the larger tiles). But how would 6x6 and 13x13 align?
I'm assuming here that perfect alignment is a desired aesthetic feature. Would you agree with that?
Many thanks in advance!
Aaron Fude
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On 24 Jul 2006 19:19:41 -0700, snipped-for-privacy@gmail.com wrote:

the world is metric. They don't make a lot of tile in the US. When we put in the Italian tile here I found out all the "inch" and "feet" numbers my tile guy was quoting were just approximations. You should get the tile in your hand and lay itr out to see if you can work with the different sizes. You might be surprised. Try to stay with the same manufacturer.
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Due to variations in actual tile .. I doubt that you could get two 6" to actually consistantly line-up with a 12" anyway. I would even guess that two 12" from different manufacturers wouldn't exactly line-up.
Mike
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