13. The non-transitory computer-readable medium of claim 12 , wherein the first visual content item comprises an image, wherein presenting the first visual content item comprises presenting the image for display.
12. A non-transitory computer-readable medium storing computer executable instructions that, when executed by one or more computing devices, configure the one or more computing devices to perform operations comprising: receiving a request for playback of narration audio content; in response to the request for playback of the narration audio content: determining a first keyword associated with a first portion of textual content, wherein the textual content represents words included in the narration audio content; determining a second keyword associated with a second portion of the textual content; retrieving, from one or more data stores, a first visual content item associated with the first keyword and a second visual content item associated with the second keyword; and automatically presenting (a) the first visual content item during playback of a portion of the narration audio content corresponding to the first portion of the textual content and (b) the second visual content item during playback of a portion of the narration audio content corresponding to the second portion of the textual content.