Which concept does not apply to a mandorla?

A mandorla, which is an oval or almond-shaped figure, is often used in religious art to encase a figure of divine significance, such as Christ or the Virgin Mary, indicating that the figure is sacred or elevated. The shape itself is commonly associated with light and symbolism relating to heaven or divinity.

Therefore, the concept of a mandorla representing celestial nature and being a shape defined by light aligns perfectly with its typical application in artworks, which are often intended to convey spiritual meanings. It also serves as a symbol of divinity, emphasizing the otherworldly attributes of the figures it surrounds.

In contrast, the notion of "earthiness" does not correspond with the primary function or symbolism of a mandorla. Instead, the mandorla serves to elevate the subject it frames, moving them away from earthly interests towards a more transcendent quality. Hence, the association with earthiness does not fit with the traditional understanding and use of mandorlas in art.