This series is inspired by a thread I saw on twitter a long time ago where people were answering the question "What is a phonon?". Unfortunately I can't find the original tweet anymore, I suppose the autor deleted it. If you happen to know the original tweet, please let me know so I can give the proper credits.
A phonon is...
When a french person goes to a vietnamese restaurant and refuses the chef's suggestion:
When you are in a movie theater and your phone rings:
If you want higher definition images, send me an email and I will be happy to provide.