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

De Bono talks a lot about provocation as a means, for example, of deliberating provoking something impossible just to provide a new perspective. For example, when trying to design a car that’s better for passengers you might provoke with something like, what would a car look like that didn’t go anywhere. Of course, you probably need the car to go somewhere, but it might lead to an idea that the doors needn’t be at the side, that the roof might change height, or that you could plumb it in. It may lead nowhere. Then again, it may lead to something new and interesting in the next step.

In case you missed the previous posts, Fundamentals of Lateral Thinking:

You don’t have to be right at every step

Lateral thinking: 4. Lateral thinking changes perspective just to be provocative

Also known as system 1 and system 2. Book: Thinking fast and slow

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Fast and slow thinking