Devil's face revealed in Giotto fresco in Italy

It is not the devil's profile [the boss does not look like that at all], but his patron's.
http://www.bbc.co.uk/news/world-europe-15624767

A devil's face hidden for centuries has been revealed in a fresco by the Italian renaissance master Giotto.
An Italian art historian, Chiara Frugoni, spotted the devil's profile in the fresco's clouds, high up in the Basilica of St Francis in Assisi.
The face, with hooked nose and an evil smirk, is hard to see from the ground.

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I saw this in the news this morning and I am perplexed how no one has discovered this previously. Its not like it is *that* well hidden.

They've always said the devil was in the details...