Two-by-four construction is sort of like the little eight-dot bricks of Lego that we all played with as kids, and you can make all kinds of cool things out of Lego at that size, and out of two-by-fours.
2×4 erinnert an diese kleinen Legosteine mit den acht Zapfen, und aus Lego kann man ja alle möglichen tollen Sachen mit diesen 2×4-Steinen machen.