On visual thinking:

Most people find it difficult to understand purely verbal concepts. They suspect the ear; they don’t trust it. In general we feel more secure when things are visible, when we can “see for ourselves.” We admonish children, for instance, to “believe only half of what they see, and nothing of what they hear.” All kinds of “shorthand systems of notation have been developed to help us see what we hear.

We employ visual and spatial metaphors for a great many everyday expressions. We insist on employing visual metaphors even when we refer to purely psychological states, such as tendency and duration. For instance, we say thereafter when we really mean thenafter, always when we mean at all times. We are so visually biased that we call our wisest men visionaries, or seers! - Marshall McLuhan

 via austin kleon