This is a crystal grid base featuring the Metatron's Cube
Metatron's Cube is a geometric figure composed of 13 evenly spaced circles in which you can also find the five platonic solids (tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron) which are foundational geometric shapes representing the building blocks of the universe.
The design was named after Metatron who is considered to be an archangel or a high-ranking celestial being in various religious and mystical traditions, including some branches of Judaism and Christianity. Metatron is often associated with roles such as a scribe, teacher, and mediator between humans and the divine and so the Metatron’s Cube is a symbol which represents the balance between the physical and spiritual realms and the interconnectedness of all life.