Large format porcelain tile, if suitably rated for wet areas (see dynamic coefficient of friction information for wet areas), can be installed on shower floors if you "fold" the tile in such a way that allows for the proper pitch and geometry in a shower space.
Imagine and map a line between the four corners of your drain grate, be it a line drain or square traditional drain, to the four corresponding corners of the shower base. The lines this makes are your relief cut lines for the tile. Cut these carefully to follow the pitch of the sloped shower base, and voila, an envelope pan folded to allow for large format tile on a shower floor. It is a common misconception that only small format mosaic can be used on shower floors. Typically this is said because larger format tiles will create lippage since they cannot conform to the conically shaped pan, or because the abundance of grout joints with mosaics is safer for a wet area. If the WDCOF (wet dynamic coefficient of friction) is high enough, tile is considered safe for wet areas according to the TCNA. This is an advanced method, and great care and planning are required for a clean outcome.

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