Shape rotation is often used as a proxy for G. The shapes generally progress in difficulty until they are deemed “impossible” for any human shape rotator to fi

Shape rotation is often used as a proxy for G. The shapes generally progress in difficulty until they are deemed “impossible” for any human shape rotator to figure out. If you reduce the problem to counting instead of shape rotation (3D matrix multiplication) many humans can “shape rotate” to impossibly high levels of IQ