That's terrazzo flooring. You lay the tiles, then the day after apply the grout. The grout is pushed across the tile surface so it fills the joints. You need to keep pushing the grout around to keep the joints topped up. You leave a couple of mm of grout on the tile surface. When dry, you use a terrazzo grinder to remove the grout whilst simultaneously grinding down any unevenness between the tiles to leave a flat floor.
Terrazzo paving is also hard work. All slabs fixed in sand and cement and tiles are heavy with sharpish edges. I have laid many 100's of metres of this stuff and it is back breaking. Although laying them is not a fine art as you can leave 'lips', once surface has been grinded down the surface is perfectly smooth.
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