### Caption

Conceptual fractal illustration of Supersymmetry (SUSY), a particle physics theory that proposes a type of spacetime symmetry relating two basic classes of elementary particles: bosons, which have an integer-valued "spin", and fermions, which have a half-integer spin. If supersymmetry is a true symmetry of nature, it would explain many mysterious features of particle physics and would help solve paradoxes such as the cosmological constant problem. There is only indirect evidence for the existence of supersymmetry, primarily in the form of evidence for gauge coupling unification. Direct confirmation would entail production of superpartners at collider experiments, such as at the Large Hadron Collider. Fractals are infinitely complex mathematical patterns that are self-similar across different scales. They are created by repeating a simple process over and over in an ongoing feedback loop.