Graphs, and other visual representations, allow you to conceptually see the system at work. Instead of one single component, multiple, more identifiable, factors become distinguishable. A basic, fundamental, understanding of system thinking is learned by observation. Visually perceiving the whole, the function can be seen. Known by visual cues, system thinking leads to a holistic interpretation. If it just snowed, we know that the road needs to be plowed and the roads may be icy. Visual graphs and depictions are a replication of what can be best understood at a broad scale.
Visual components can unleash massive amounts of creative potential and ordinarily people can relate more naturally to this option. If data was only expressed in descriptive terms, understanding would be highly limited. Visual depiction allows for a fuller, more comprehensive overview. Rather than a linear representation, webbed diagrams, circle charts etc., allow for multiple interactions to be seen and accounted for. Not only can pictures give a snapshot of the scene, but they can link emotional connection as well. For example, the Hidden Gems campaign; seeing the proposal on a map and real photos of the areas together, allows for a more sincere connection to be made. Showing people photos of malnourished children allows the reality and severity of some system outcomes to be recognized more fully. People are visual learners, this is where we started our learning career and this is how it will continue.
Great point about the emotional power of imagery. There is a lot of research out there that shows that we are more likely to remember and care about a message if it's connected to an emotionally loaded image. Hidden Gems is a great example. Very similar to conservation campaigns by the World Wildlife Fund and the National Resource Defense Council.
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