It is a fascinating experience, it is a circle in the earth where, to be in the center, and make a sound, it seems to resonate with echo, as if we were inside of a tube, or surrounded by walls, despite being in an open space, the effect disappears if we move a few inches in any direction. It is believed that these places have a special connection with the cosmos and the celestial plane, are charged areas of energy and are deeply linked to nature. The focus tonal acts as a healer of physical ailments, emotional, and spiritual, and until now has not found a scientific explanation to clarify this phenomenon. In the world there are only six pockets tonal recognized; one is located in Poncitlán, Jalisco, while the other five are in China, Germany, France, England and Spain. The focus, tone of Teotihuacán is of recent discovery and is an unforgettable experience.