Chemistry students evolving from noobs to pros! The top shows butane with every single atom and bond meticulously drawn out (regular Pooh). The middle shows the molecular formula CH₃CH₂CH₂CH₃ (fancy Pooh), which is what you write when you're too lazy for structural formulas but still want to show off. And finally, the bottom shows the simplified skeletal structure (monocle Pooh) where carbon and hydrogen atoms are implied because ain't nobody got time for drawing all 14 atoms when you've got 50 more compounds to name before the exam. It's the chemical equivalent of texting "k" instead of "okay" – maximum efficiency, minimum effort!
The Three Stages Of Chemical Notation Enlightenment

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