I just found a blog that I haven't read yet through a Pinterest link. The title of the post was Marshmallow Minute. John Berray uses examples of a Lite Brite and an Etch-a-Sketch to differentiate between discrete and continuous.
Even though I'm not currently teaching Algebra, I could use it to clear up misconceptions in my Pre-Calc class. Here is the poster I made from his inspiration.
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