A castell is made of different parts that have different functions and are built differently.
This refers to the three uppermost levels of the tower, apart from pillars. It comprises the canalla (the youngest castellers): the enxaneta (“crowner”) who, on arriving at the very top raises his/her arm and salutes the public (i.e. the castell is crowned); the acotxador (“croucher”) and the dosos (“twos”)
The trunk is the vertical structure which forms the skeleton of the structure. It consists of a number of castellers on each level, varying from 1 to 9 depending on the castell. The strongest people are at the bottom, on top of the pinya and the most agile and lightest on the top levels.
The pinya is the horizontal base of the construction on which the accumulated weight rests and is used to stabilise and strengthen the structure. It involves order and discipline as everybody has a precise position and role.
As the castell is erected, different tunes are played to identify what is happening. The gralla (an old kind of flute) and the timbal (a small drum) provide the traditional musical accompaniment to performances.