Aesthetics is not disjoint from utility. Indeed, there's a convertibility because the utility of a tool is related to its beauty as tools are essentially define

Aesthetics is not disjoint from utility. Indeed, there's a convertibility because the utility of a tool is related to its beauty as tools are essentially defined by their utility. A tool that has higher utility is more beautiful according to that measure, whereas one that is mediocre is far less so. There may be decorative aspects that may enhance the beauty of a tool in a way that perhaps does not contribute to utility (though I am not certain this is entirely the case as the function may simply be subtle), or the decorative aspects may be considered beautiful apart from the tool's utility, but the beauty of the tool is not simply decorative. A beautifully machined screw driver of the highest craftsmanship is ugly if it fails to function as a screwdriver.