The Brain Cacti gets its name because of its unique shape! Not only as they easy to grow, they will be a quirky addition to your house or garden.
They make great indoor plants; mix them in a succulent dish with other cacti for a beautiful arrangement. Because they are a cactus, they can also thrive outside in warmer climates.
Try to water from the base of the plant to avoid overwatering. Because they are most sensitive to moisture, you want to keep them in a dry place with little humidity.
You can read more about how to take care of them here: https://www.gardeningknowhow.com/ornamental/cacti-succulents/mammillaria/brain-cactus-information.htm