Key Idea: Set size means set abundance for the sake of simplicity (layman's terms) ignoring rigorous math (countable and uncountable sets, dense, etc.)
Natural numbers are less abundant than the integers; integers are less abundant than the rational numbers; rational numbers are less abundant than the algebraic numbers, and finally, algebraic numbers are less abundant than the transcendental numbers. Therefore, we can see the above image as a hierarchy of set abundance or set size from the smallest set, the set of all natural numbers, to the largest set, the set of all transcendental numbers.
Thus, the image above is good!