A change-speed gearbox, in particular for motor vehicles such as hybrid passenger cars and small trucks, comprising input and output shafts, clutches, and gear wheel pairs with fixed and loose wheels. A plurality of data objects representing one or more user identities, permissions, and resources of an organization computing system are received. The shell may be wholly or partially made of parts of the assemblies of filtering membranes. The intermediate layer may include one of a bladder or a hydrophilic material that expand upon the introduction of a fluid, a shape memory polymer that deforms upon application of a stimulus, or two materials that react chemically to form a gas. A plurality of water nozzles may selectively discharge streams of high pressure water inwardly to sculpt the ice column.