Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.
What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:，这一点在爱思助手下载最新版本中也有详细论述
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Beagle Bros catalogs and manuals were filled with old-timey woodcut illustrations repurposed to tell jokes:，推荐阅读heLLoword翻译官方下载获取更多信息