In a perspective just published in the IUPAC journal Pure and Applied Chemistry, Marta, Ben, and Zhe discuss how host-guest interactions in nanomaterials can be used to control their synthesis and dimension. https://www.degruyter.com/view/journals/pac/ahead-of-print/article-10.1515-pac-2020-0701/article-10.1515-pac-2020-0701.xml