Mask of Madness
Mouth of Hell
When you visit the park and enter the "Mouth of Hell", there is a tongue upon which stands a picnic table and seating for a small group! (source)
Orsini was probably influenced by earlier works from temples, such as this one in Vietnam.
When I visited Carlo Marchiori's "Ca'toga", he has two monster gates that he constructed himself!
Here is a modern monster gate with clown features for a circus.
And when you see some modern interpretation and others think how clever they were, you will know the origins of their ideas!