A skin cell, specifically an epidermal cell, is shaped like a flattened version of a tetrakaidecahedron, a 14-sided 3D solid with six rectangular and eight hexagonal sides. This unique shape was proposed in 1887 as the optimal way for cells to pack together and form an effective barrier.
The shape of the skin cell contributes to its function as a protective barrier against the environment. The tightly packed cells form a barrier that prevents the loss of moisture and the entry of harmful substances. The shape also allows for flexibility and movement, which is essential for the skin's ability to stretch and bend.
