As we saw in the full documentary, the cajón was used as a means of communication in the days of slavery between the communities of escaped slaves and their brothers and sisters who had not been able to escape. This mirrors the "talking drums" found in many regions of Africa.
Izquierdo explained the meaning of two of the rhythms in the documentary. Here, we have included everything that he told me about the topic. First we get a repeat of what we saw and heard in the documentary and then he continues on, demonstrating and explaining two other rhythms.
The communities of escaped slaves were called "palenques:' the escaped slaves referred to each other as "cimarrones." The palenques were often located in the jungle, and often were in contact with indigenous peoples as well.