1. A method comprising: receiving, by an augmented reality system, a series of images corresponding to views of the real world; processing, by the augmented reality system, the series of images to determine presence of a first object; determining, by the augmented reality system, that the first object meets a first set of conditions such that the first object belongs to a first object category; responsive to the determination that the first object belongs to the first object category, providing an audio response in the form at least one of the following types of audio responses: communicating a predefined sound to an augmented reality user and/or changing audio characteristic(s) of a sound not generated by the augmented reality system which is being experienced by the augmented reality user; determining the augmented reality user's emotional reaction to seeing a second object; and defining the first object category and its associated first set of conditions by machine learning based, at least in part, on the emotional reaction that the augmented reality user had to the second object such that the second object belongs to the first object category.