For a long time, it was typically considered that the solid state is not well suited to sustaining fast molecular motion, including rotational motion, because dense matter does not provide sufficient space to allow movements of significantly large scale. However, in recent years a variety of molecular machines, switches and rotors have been successfully engineered within porous crystals and on surfaces. Supramolecular framework materials have seen rapid focus in the past few years as a platform for the installation of molecular rotors. These amphidynamic crystals, which possess crystallinity yet support dynamic behaviors, are an emerging area of research in the field of molecular machines. The organic linkers in a covalent or metalorganic framework are embedded in a crystalline assembly, yet at the same time they are not "packed" but separated from each other and kept in place by the framework. Their spacing is controlled by the length of the linkers and the coordination mode of the inorganic part. Moreover, the rotors are exposed to the porosity and can interact with guest molecules, and influence the thermodynamics and kinetics of adsorption. Here we highlight some of the recent advances in this area of research, and refer the reader to Refs. 163, 164, 165, 166 for more comprehensive reviews on the topic.