Here s another optical illusion that can work in your favor.
Large tiles in small bathroom.
The larger the tile the fewer grout joints you ll have and the greater sense of spaciousness you ll feel.
Blending the tile to the wall doubles your space in a small bathroom.
Just keep them for small surface areas shower splashback alcoves and use bigger tiles to cover larger expanses.
Consider large format tile in small bathrooms a large format tile is great for small spaces.
Tiles set in a diagonal pattern across the floor can help a small bathroom be perceived as larger than its actual size.
The reason has to do with grout joints.
Only use light coloured tiles.
Visually it would cut the size of the bathroom in half making the shower appear to be a separate space.
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There is a risk smaller tiles might be too busy in a small bathroom but if you have found some tiny tiles you are obsessed with of course you can still use them.