Here is a levitating wooden planter that holds your plants in midair without requiring any electricity. The TEGLC Levitating Wooden Planter has an inner plastic pot that measures 2.3 inches in diameter. The wood is surface-treated with oil for protection against water.
This levitating planter has a 5.5 x 5.5 x 0.5 inch base. You can find out more about it here.