How touchless user interfaces can amplify the user experience
A touchless UI has an edge over devices that require touch interactions because decreasing physical contact is helpful in diverse contexts—from food-processing plants to an airport’s self-service registration kiosks. The COVID-19 pandemic has made it obvious that we need to incorporate this technology into many more apps and products.
Abdul Basit provides a good overview of the various technologies and approaches in UXmatters.
Experientia has done work on this very topic a few years ago, exploring two navigational frameworks for keyless devices. See here for more.