GargoyleGargoyles are functional building elements which are responsible for diverting water away from the walls in order to prevent it collecting at the foundation. As such, by necessity these water spouts will usually extend beyond the face of the buildings wall. The term gargoyle, comes from the Latin root "gurgulio", and the Old French "gargouille", meaning throat. It is no surprise then that Gargoyles pass rainwater through their throats and out of their mouths!
Example of a Gargoyle
GrotesquesGrotesques are (more often than not) purely ornamental decorations and the term normally refers to mostly eerie figures. The term is generally used to describe the ugly, disgusting or fantastic etc. and can be used for things from whole creatures to lone heads. These can also be labelled as Chimera(e).
Example of a Grotesque
I'll spare you a lengthy history, but it is enough to know that Gargoyles can be seen as far back as ancient Greek architecture, where rain water run off was often directed through the mouths of lions heads carved into the stone work!
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As for Susan Boyle... I suppose she's the exception to the rule. Being both a Gargoyle and a Grotesque!?