Tile Size and Slipperiness

For those who are observant, they would notice that the tile size used in the bathroom are normally much smaller than the other parts of the house.  Besides the surface of the tile, the size of the tile also affects the slipperiness of the surface. Smaller the tiles, the more tiles are required to lay in an area. This increases the number of line gaps within the area. The more lines the more friction it can provide for the feet or shoes. As such, the surface become less slippery. Do note that you would still need rough surface tiles for wet areas.