There is a difference of thickness in wall tiles and floor tiles. There is also
a difference in the grout used, sanded for floors, non-sanded for walls. If
your floor or walls are uneven a smaller tile is easier to make level and flat.
A larger tile can create more waste than smaller tiles.
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Lighting:
"Task" lighting is functional. It should be evenly
distributed around the mirror, whether it is above or on both sides. It also
needs to light all areas of the room, so you can see clearly even when in the
shower which may mean ceiling lighting as well. If you enjoy a long soak in the
tub, you may want "mood" lighting as well. This could be as simple as putting a
dimmer on the task lighting or using candles. But it could be adding wall
sconces or some other secondary lighting.