Spacing affects where the eye is drawn. For example, proximity will allow you to group similar ideas whereas a hierarchy prioritizes one idea over others. Does every point deserve equal weight to convey your message?
The Rule of Thirds is another design principle, which divides a single visual into nine equal parts. Important visuals are placed along the intersections of the parts to create visual interest and energy rather than simply centering the subject.
Academic posters should aim to guarantee equal access to everyone, such as those people who are colorblind or visually impaired.
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Source: TAMU Writing Center
There are several ways to convey messages visually.
Determine which type of visuals will best present the message to the intended audience.
Decide your purpose and choose your visual:
Visualizations that focus on UNDERSTANDING should include a reference range, benchmark, or indicator to bring more meaning to the visualization. These can be helpful for folks who want to see the opportunity for action in the story — they want to see a measure or target associated with the numbers.
OR
Source: Visualizing Data Stories from the Northwest Center for Public Health Practice
Consider how the first image does not direct the audience to any particular metric compared to the image on the right. The title also tells the audience what information to look for in the image on the right.
Source: Northwest Center for Public Health Visually Communicating Public Health Data