Many material properties depend on how electrons are arranged inside a material. Their distribution determines, for example, whether a material conducts electricity or displays magnetic behavior. Understanding how electrons organize themselves at the atomic scale is therefore one of the major challenges in materials science. Now, a team led by researchers at the Institute of Materials Science of Barcelona (ICMAB-CSIC) has developed a new technique that, for the first time, reveals how electrons are organized inside materials with an unprecedented level of detail.