" A quantum atom with two electrons is a much more complicated object to visualize, and I'm not aware that it's ever been done very well. The challenge is that for each possible position of one electron, the wave function of the other is a different three-dimensional object. So really, the natural home of the total wave function, for the two-electron system, is a space of 3 + 3 = 6 dimensions. It is quite a challenge to present such an object in a way that human brains find meaningful. "

― Frank Wilczek , A Beautiful Question: Finding Nature's Deep Design