I shall always remember when I was finally taught that the trick is to dip your finger in the wine first.

Make a wine glass sing

Not the standard physics laws of expansion.

Work expands to fill the available time — also known as Parkinson's Law

Stuff expands to fill the available space — also known as Jono's Law

Cost expands to fill the available budget — also known as life

After grandiosely naming "Stuff expands to fill the available space" as Jono's Law, I came across "Ryan's Application of Parkinson's Law: Possessions increase to fill the space available for their storage," in Arthur Bloch's Murphy's Law Book Two, p 84, which, at least, is perhaps not as pithy.

Laws of expansion

References and a better looking and interactive explanation on cuteify. Inspired by a brilliant little exhibit at the even brillianter Exploratorium in San Francisco. 

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Rules of cute