This intriguing story of detection and discovery stands testimony to how our eyes and minds are predisposed to find patterns, not to discount them. In our distant past this was essential for survival, for example; if a person in the jungle glimpsed a pattern of light and dark stripes in the shadows, it would be prudent to assume that the pattern was a tiger and act accordingly. The consequences of incorrectly assuming that the pattern is not a tiger, far outweigh those of incorrectly assuming that it is. But as you will see, when applied to random events this primal survival skill leads to errors in judgement.

Source: Decoding Britain’s Lost Masonic Secret — ASHLEY COWIE