Only when it comes to pyramids made of inadequate materials, such as ferromagnetic, diamagnetic or aluminum with an excessive percentage of these, copper or zinc. In high purity aluminum pyramids hardened to silica or wood, although very high energy rates are achieved, the vibratory quality of this will determine excellent effects. A correctly constructed and installed pyramid can produce strange sensations at the beginning, to an extremely sensitive person, when the body experiences it for the first time, but such a rarity will be the product of a conditioned psychological and/or cerebral interpretation, which changes very quickly upon assuming the body the benefits that receive. These rarities are clarity and memory of dreams, deep relaxation of the body but calm and clear mind, etc. In hours or at most days, every person gets used to the pyramidal action and stops feeling the immediate effects. However, the long-term effects (cellular longevity, endocrine balance, immune system strength, blood pressure regulation, etc.) will persist.