When people look at things, they generally think about whatever they're looking at. So if you want to be sure people focus on certain things during your meeting or presentation, visuals can really help.
Posters are a great way to keep that info front and center in everyone's mind. Your posters don't need to be fancy. But they do need to be clear. Very clear. So clear people can get the info in a glance.
The poster above was created for a workshop I taught about thinking styles. It was used during a hands-on group activity to remind each group to try out all four thinking styles. The thinking styles are color coded, so it's easy to focus only on one square at a time. Yet, it gives a clear picture of the whole process. That way, people can move about the process at their own pace and see how they're connected.