Explore the fascinating world of nanoparticle assemblies in this 36-minute conference talk by Dmitry Baranov from Lund University. Delve into the collective X-ray diffraction and photoluminescence phenomena observed in perovskite nanocrystal superlattices. Gain insights into the hierarchical approach to functional materials operating at the mesoscale, where atomic nature meets structural complexity. Discover how this interdisciplinary field combines chemistry, materials science, chemical engineering, and physics to create innovative nanoparticle assemblies. Learn about recent developments and future directions in this cutting-edge research area, as presented at the Kavli Institute for Theoretical Physics conference on Structure Design and Emerging Phenomena in Nanoparticle Assemblies.