So rocking a rock salt finish isn't rocket science ... You could even summon household bleach for that mold and grime clinging to the old concrete. Now, given you are layering fresh concrete ...

Let’s talk about why the moss, mold and mildew grow in the first place. Many years ago I couldn’t understand how it could grow on solid rock, precast concrete or brick, but now it’s crystal ...

The rock provides durability and strength ... the team built the concrete up in layers in a mold, which compacted it under pressure. They found this enhanced the strength of the blocks.

The process requires the use of a pair of six-axis robot arms to stretch lycra molds into parametric shapes, which humans then fill in with a mix of concrete and fiberglass. After about 45 ...