This article, published in Angewandte Chemie International Edition, discusses a study conducted by Koki Sano, Yasuhiro Ishida, and their colleagues on the design of photonic crystals that can display structural colors. The researchers developed a reconfigurable photonic crystal made of inorganic nanosheets suspended in water. They found that the crystal can exhibit single-peak and double-peak structural colors when subjected to different temperature conditions. This research provides insights into the design and manipulation of photonic crystals for various applications. [Extracted from the article]