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Gold (Au) and Bismuth (Bi) are out here living their best lives, all chill and stable, while Mercury (Hg), Thallium (Tl), and Lead (Pb) are having a full-on existential crisis in the form of creepy X-ray nightmare fuel. Why? Because heavy metal poisoning is no joke. These three are notorious for their toxicity—mercury messes with your nervous system, thallium was literally used as rat poison, and lead... well, lead poisoning is why we stopped putting it in everything from paint to gasoline.
Gold is so inert it just sits there looking pretty (hence its use in jewelry and electronics), and bismuth is surprisingly non-toxic compared to its neighbors on the periodic table. Meanwhile, the toxic trio in the middle are giving off serious "we will ruin your day and possibly your brain" energy. The contrast between the casual stick figures and the horrifying skeletal beings perfectly captures the difference between "safe to handle" and "please wear gloves and possibly a hazmat suit."
