Jordi Poater (ICREA Research Professor at Univ. Barcelona, ex-IQCC member), Miquel Solà from the Institute of Computational Chemistry and Catalysis (IQCC) and Clara Viñas and Francesc Teixidor from the Institute of Materials Science of Barcelona (CSIC, ICMAB) have shown that aromatic closo boron hydride clusters can be categorized into different series, according to the n value of the Hückel (4?n+2)? rule. This classification arises from a link between the two-dimensional Hückel rule, followed by aromatic [n]annulenes, and Wade–Mingos’ rule of three-dimensional aromaticity, applied to the aromatic [BnHn]2? closo boron hydride clusters. These researchers have written the corresponding article and published the back cover that was designed by catalan artist Iñaqui Sanjuán Pertusa.