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Science News from research organizations The shape behind the Einstein problem just revealed strange new physics Date: September 15, 2026 Source: Institute of Industrial Science, The University of Tokyo Summary: A mathematical shape famous for covering a surface without ever repeating has revealed an unexpected ability to twist light into unusual chiral patterns. The discovery could lead to new ways of controlling light, polarization, and advanced optical devices. Share: FULL STORY Researchers from the Institute of Industrial Science, The University of Tokyo experimentally demonstrate unique optical behavior from a long-sought aperiodic pattern. Credit: Institute of Industrial Science, The University of Tokyo A mathematical shape that drew global attention for solving a decades-old puzzle is now revealing an unexpected connection to physics. Researchers have found that structures based on the shape can make light form unusual chiral patterns, pointing to new ways of exploring how geometry can influence optical behavior. In a study published in Nature Communications, researchers from the Institute of Industrial Science, The University of Tokyo, and collaborating institutions built optical structures inspired by the "Smith hat." This unusual shape is known for solving the so-called Einstein problem in mathematics. When the team illuminated the structures with laser light, they observed diffraction effects unlike those seen in conventional quasicrystals. The Shape That Solved the Einstein Problem The Einstein problem asks whether a single tile shape, known as a "monotile," can cover an entire surface without creating a repeating pattern. Familiar tilings such as checkerboards and honeycombs repeat in a regular way. An aperiodic monotile, by contrast, can fill a surface without ever settling into a repeating arrangement. In 2023, researchers discovered the first such monotile, the Smith hat. The finding attracted widespread attention because it provided a long-sought solution to the mathematical problem. "What is especially fascinating about the hat tile is that, although the resulting pattern appears irregular at first glance, it is actually constructed from the honeycomb lattice," says lead author Yuto Moritake. "We wanted to see whether this unique shape could also produce any unexpected physical phenomena." Turning a Mathematical Pattern Into an Optical Structure To test that possibility, the researchers created nanoscale versions of the pattern on silicon nitride films using electron beam lithography. When laser light was directed at the structures, the resulting diffraction patterns formed distinctive pinwheel-like shapes. These patterns directly revealed the chiral character of the aperiodic structure. Chirality refers to a form of handedness in which a structure and its mirror image cannot be perfectly matched. In this case, the unusual arrangement of the monotile pattern caused the light itself to display a chiral response. "We found that the diffraction patterns themselves become chiral because the structure lacks mirror symmetry," explains senior author Masaya Notomi. "This kind of optical response is fundamentally different from that observed in conventional quasicrystalline materials." Light Responds to Direction and Polarization The researchers also found that the diffraction pattern changed depending on both the direction and polarization of the incoming light. When the physical structures were mirrored, their optical behavior reversed as well. This showed that the response of the light was directly tied to the symmetry of the underlying pattern, revealing a new type of symmetry-controlled optical behavior. "These results open a new direction of research on the fusion of quasiperiodic order and chirality," remarks Moritake. "Monotile patterns provide a platform for exploring optical phenomena that emerge from the interplay of symmetry, chirality, and aperiodicity." From Abstract Mathematics to New Optical Physics The researchers say structures inspired by monotiles could eventually contribute to technologies designed to manipulate light, control polarization, and support advanced optical devices. More broadly, the findings show how a discovery that began as an abstract mathematical puzzle can lead to unexpected physical effects. The Smith hat was first celebrated for solving a question about how shapes can cover a surface. Now, its unusual geometry may also help researchers uncover new ways to control and study light. RELATED TOPICS Matter & Energy Physics Nanotechnology Graphene Telecommunications Computers & Math Mathematics RELATED TERMS Möbius strip Nanoparticle Mathematical model Solar power Lead Knot theory Physics Nanotechnology Story Source: Materials provided by Institute of Industrial Science, The University of Tokyo. Note: Content may be edited for style and length. Journal Reference: Yuto Moritake, Masato Takiguchi, Takuma Aihara, Masaya Notomi. Chiral diffraction from aperiodic monotile structure. Nature Communications, 2026; 17 (1) DOI: 10.1038/s41467-026-75023-7 Cite This Page: MLA APA Chicago Institute of Industrial Science, The University of Tokyo. "The shape behind the Einstein problem just revealed strange new physics." ScienceDaily. ScienceDaily, 15 September 2026. . Institute of Industrial Science, The University of Tokyo. (2026, September 15). The shape behind the Einstein problem just revealed strange new physics. ScienceDaily. Retrieved September 15, 2026 from www.sciencedaily.com/releases/2026/09/260914102432.htm Institute of Industrial Science, The University of Tokyo. "The shape behind the Einstein problem just revealed strange new physics." ScienceDaily. www.sciencedaily.com/releases/2026/09/260914102432.htm (accessed September 15, 2026). Explore More from ScienceDaily RELATED STORIES TRENDING AT SCITECHDAILY.com 90-Million-Year-Old Fossil Reveals a Small Dinosaur Living Along Japan’s Coast Stardust Buried in Antarctic Ice Exposes an 80,000-Year-Old Cosmic Mystery Scientists Resurrect 160-Million-Year-Old Molecules With Surprising Power Against Superbugs A 400-Degree Mystery Is Hiding Deep Inside Mars