more is different
/ MOR iz DIF-runt /
Imagine you know everything about one brick — its size, weight, and strength. Does that tell you what a cathedral is? Not really; arches, towers, and acoustics are facts about the arrangement of many bricks, not about any single one. This is the idea captured in the phrase more is different.
More is different is the title and message of a famous 1972 essay by the physicist Philip Anderson. His point was that at each new scale of size or number, matter obeys its own new laws that are not simply read off from the laws of the smaller parts. Knowing the rules for one electron does not, by itself, let you derive magnetism or superconductivity; those require new concepts that only make sense for the whole crowd.
This matters because it pushes back against the assumption that all of science reduces to particle physics. Anderson argued that chemistry, biology, and condensed-matter physics each have their own genuine, irreducible principles. An honest caveat: this is a claim about how science is actually done and understood, not a claim that the large violates the laws of the small — the bigger laws are still consistent with, just not derivable from, the smaller ones.
Every water molecule obeys the same physics whether it is alone or in a glass, yet only when trillions gather do brand-new properties appear — surface tension, freezing, the ability to flow — properties that simply have no meaning for a lone molecule.
Surface tension is real for a glass of water but meaningless for one molecule.
More is different is not anti-reductionism in the sense of rejecting fundamental physics; it accepts the small-scale laws but denies that they alone are enough to understand the large-scale world.