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Potential temperature and temperature surfaces are two topics that just blow my mind in meteorology.
Potential temperature is the actual temperature of air or water standardized to a constant pressure. And in meteorology that pressure implies height.
Here are some of the basic implications of Potential Temperature ( θ ):
Space close to Earth is extremely hot despite the temperature
The core of the earth and any other planet is extremely cold despite the temperature.
These are typically opposite of intuitive concepts, but are true nonetheless.
We can observe Potential Temperature ( θ ) in nature.
From hiking in the mountains, we know that it's cooler when we go up. Snow falls on the tops of the mountains first. Etc.
But we also know that warm air should generally rise because it's less dense.
And this is where Potential Temperature comes in. If you were to bring that mountain air down to the surface pressure, it would expand, the added pressure on it would warm it. The mountain air would be WARMER than the other air at the surface.
Thus the atmosphere is stacked how you believe it should be. With less dense ( higher potential temp) air on top of more dense ( lower potential temp) air.