A method of operating a client device within a viewing environment is described. The method includes: receiving content at a client device, presenting the content to a viewer by rendering the content as rendered content on a display surface in operable communication with the client device; receiving engagement data at the client device, the engagement data indicating a level of engagement with the content of at least one user who is viewing the rendered content; and adapting presentation of the content in dependence on the engagement data by changing how the content is rendered on the display surface. Related systems, apparatus, and methods are also described.