The quantum anomalous Hall effect (QAHE) is a fascinating phenomenon in condensed matter physics, where materials exhibit quantized Hall conductivity without an external magnetic field. While this effect has profound implications for quantum computing and electronics, it also raises an unusual question: which famous outdoor sculptures might remain "invisible" to QAHE?

In the context of QAHE, "invisibility" refers to sculptures made of materials or positioned in ways that don't interact with the quantum states involved in this effect. For instance, large metallic sculptures like Chicago's "Cloud Gate" (The Bean) or New York's "Charging Bull" could theoretically disrupt quantum states due to their conductive properties. However, sculptures made of non-magnetic materials like stone or wood, such as Denmark's "The Little Mermaid" or Brazil's "Christ the Redeemer," might not influence QAHE.

Interestingly, the QAHE's sensitivity to material composition and electromagnetic fields suggests that sculptures with minimal metallic components or those placed in low-interference environments could be considered "invisible" to this quantum phenomenon. This intersection of art and quantum physics offers a unique lens to appreciate both fields, highlighting how even monumental sculptures might interact—or not—with the unseen quantum world.

While the idea is largely theoretical, it sparks curiosity about the hidden relationships between macroscopic art and microscopic quantum effects. Whether QAHE truly "sees" these sculptures remains a playful yet thought-provoking exploration at the boundary of science and culture.