That statement is false. While some atomic orbitals are spherical, many are not.

Here's why:

* S orbitals are indeed spherical, but they represent only one type of atomic orbital.

* P orbitals have a dumbbell shape with two lobes on opposite sides of the nucleus.

* D orbitals have more complex shapes with multiple lobes and sometimes rings.

* F orbitals are even more complex with even more lobes.

Therefore, saying that all electron probability clouds are spherical is incorrect.