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Football fields also have the fun property of varying in the third dimension. They're built with a crown in the middle so that water will drain off towards the edges, and that can vary significantly between instances.

And pixels are even starting to vary in the third dimension too, with the various curved and bendable and foldable displays.

Pixels used to be realized non-flat in the CRT days.

Pixel counts generally represent areas by taking the number of pixels inside a region of the plane, but they can represent lengths by taking the number of pixels inside a certain extent of a single line or column of the grid: it is, actually, a thin rectangle.

What's the standard size of a city block, the other countable example given by the original author?

Yes, city blocks are like pixels or apples. They do not have a standard size or shape.

Edit: To clarify, if someone says 3 blocks that could vary by like a factor of like 3 or in extreme caesx more so when used as a unit of length it is a very rough estimate. It is usually used in my country as a way to know when you have reached your destination.