Castell, Human Tower, Catalonia, Spain

Very high towers and ones with a small number of people on each level normally need extra support from the base or bottom levels. These base levels are frequently indicated as part of the name of the tower. Three kinds of base levels are most commonly used:
- Pinya ("bulk"): the ground-level base, often composed of several hundred people. All towers have this, but it is never mentioned in the name.
- Folre ("cover"/"lining"): a second-level base built on top of the pinya. It is always mentioned when used.