Final answer:
The tile-setting process described is the thick-set process, which involves using a Portland cement mortar bed to accurately set tiles with proper slopes and planes.
Step-by-step explanation:
The tile-setting process in which ceramic tile is applied over a Portland cement mortar bed, allowing for accurate slopes and planes in the finished work, is known as the thick-set process. This method allows for more versatility in creating inclines and flat surfaces, which can be particularly important for ensuring proper water drainage in areas like bathrooms and for achieving level surfaces when laying tile. The thick-set process differs from other methods such as the thin-set process, which uses a thinner layer of adhesive that directly bonds to the substrate, and the dry-set process, which also uses a thinner mortar bed.
The thick-set process can be ideal for creating durable and lasting tile work, much like the mosaics mentioned, which have been used historically in various structures, including mosques, to create long-lasting, intricate designs. The strength and durability of the thick-set method make it suitable for both indoor and outdoor applications where the conditions or the design require the unique advantages that this method offers.