[villagetinker]

Originally Posted by Waverunner

I believe you have to use grout for all rectified tile installations. The tile has very even edges and can use much narrower grout lines, but still needs grout. Large tile with similar colored grout blends in to look almost seamless. I love the look with polished tile.

I agree, I cannot imagine a tile floor without grout between the tiles. If you are asking about very thin grout lines, contact Dal-Tile (distributor) for specific tile and grout recommendations, you do not want to make a mistake. Then make sure the installer can do want you want the way you want it done.
Hope this helps.