facts
Explanation
The comic shows two people in conversation. One person, appearing agitated, says: "If a bunch of 'facts' are coming out against my view, that just shows you hidden forces are trying to overthrow my view because it's so true." The other person responds admiringly: "Wow. So beautiful. Like a crystal."
The caption below reads: "Mathematically, my uncle is said to exhibit viewpoint invariance under new information."
The humor operates through a satirical mathematical metaphor. "Viewpoint invariance" is a term borrowed from mathematics and physics, where invariance describes a property that remains unchanged under certain transformations. Here, the "transformation" is new information (facts), and the "invariant property" is the uncle's opinion, which never changes regardless of what evidence is presented.
The comic skewers a common style of conspiratorial thinking in which contradictory evidence is reinterpreted as confirmation. If facts support the person's view, they are proof they are right. If facts contradict their view, they are proof of a conspiracy to suppress the truth, which means the view must be especially important and therefore even more correct. This creates an unfalsifiable belief system -- a closed epistemic loop where no possible evidence could ever change the person's mind.
The comparison to a crystal is both sarcastic and apt: crystals are rigid, symmetric structures that look the same from every angle, just as this person's viewpoint looks the same regardless of what new information you throw at it. The mathematical framing in the caption elevates stubbornness and willful ignorance to the level of an elegant mathematical property, which is the core of the joke -- dressing up intellectual vice as if it were a beautiful abstract concept.