basic
Explanation
This comic shows a physics professor at a chalkboard with a drawing of a sphere with rotation arrows (labeled with angular momentum L and clockwise/counterclockwise notation). The professor says: "That's right. No more simplistic 101 stuff."
The caption reads: "In advanced physics, you learn about perfectly spherical cows under rotation."
This is a layered physics joke building on one of the most well-known tropes in physics humor: the "spherical cow." The spherical cow joke refers to the tendency of physicists to make extreme simplifying assumptions to make problems tractable. The classic version is: "Assume a spherical cow..." -- meaning physicists will approximate even obviously non-spherical objects as spheres to make the math easier.
The comic takes this a step further by suggesting that "advanced" physics doesn't abandon the absurd simplification -- it just adds more sophisticated mathematical treatment to the same absurd simplification. Instead of a static spherical cow, you now have a rotating spherical cow, requiring angular momentum calculations and rotational symmetry analysis. The chalkboard shows notation consistent with angular momentum (L) and rotation.
The humor lies in the irony that advancing in physics doesn't mean your models become more realistic -- it means you apply increasingly powerful mathematical tools to equally unrealistic idealizations. The cow is still perfectly spherical; you're just now studying its moment of inertia and rotational dynamics. This is a affectionate jab at how physics education works: the simplifications never go away, they just get dressed up in fancier mathematics.