Here’s a delightful image I use to introduce my lesson on the Black Death and 100 Years’ War in my Ancient World History class. I display it, without explanatory text, at the beginning of the class as a bellwork activity. The students try to guess what the painting depicts and who the figures are. With my predominantly Arab student population, most of them aren’t familiar with the idea of the Four Horsemen of the Apocalypse, but the kids display insight and creativity in coming up with responses. Through class discussion, the students are eventually able to identify the spectres of war, death, famine, and plague as issues that medieval Europe faced.
This is just one example of how my bellwork activities hook kids and introduce my lessons. Using an image or video is oftentimes more useful than a text: reading a text takes longer and appeals to a narrower segment. The barriers to entry of visual analysis are much lower, so even lower-level students are engaged. Furthermore, the kids do a surprisingly thorough job of teasing out the details and making inferences, although I sometimes have to guide them.
Some other examples of visuals as a hook for a lesson: