OK !
Draw a poly then move it from 0,0,0 to 0,0,1e99
It is a famous formula for those who want to "flatten" objects except that you don't run it 'till the end (you don't move back 0,0,0 to 0,0,-1e99)
Then you get this strange image !
In French we give the "tongue" to the cat (strange expression, isn't it ?)... Happy to know that in English, we let him go out of a bag,...cats don't like being in a bag !