In architecture, a gargoyle is a carved to convey water from a roof and away from the side of a building preventing rainwater from running down masonry walls and eroding the mortar between. Medieval cathedrals included gargoyles and chimeras. The most famous examples are those of Notre Dame de Paris. The primary use was to convey the concept of evil through the form of the gargoyle, which was especially useful in sending a stark message to the common people. Gargoyles also are said to scare evil spirits away from the church, this reassured congregants that evil was kept outside of the church’s walls. Most have grotesque features, some gargoyles were depicted as monks, or combinations of animals and people, many of which were humorous.