After staring at the tiles for 30 seconds I found the pattern (4 aligned rows followed by an offset row), but… why the hell would you lay these out like that? It looks so jumbled.
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This is done intentionally, and repeats further throughout the installation. The main reason is it prevents long runs of grout lines. The installation will be stronger, and there’s no need for an expansion joint. Additionally, it’s harder to see if the grout joint shifts one direction or the other over a long run.
I don’t think it need to be done every fifth tile though- that’s a design choice by the installer.