Spoke with Carlos Niño Murcia, the writer of the book Territorio chamánico 2015. While talking he made this drawing of a Marguaré, a drum that is used to communicate between indigenous communities living in the Amazon. The instrument is made from two big tree trunks, hollowed out by burning. With wooden sticks they beat the drum to send messages, invitation for ceremonies or even to declare war with to the neighbours. The sound can be heard on a distance of about 20 kilometres.