Stage has three levels: lowforelevel in front of curtain for Narrator, main level for most of the action, slightly higher level for the balcony.
1971, Occasional Papers of the Museum of Natural History, the University of Kansas:
The parasphenoid bears a large cultriform process; the anterior end of the process is truncate and lies at theforelevel of the orbit.
2006, Ronghua Liang, Zhigeng Pan, Adrian Cheok,Advances in Artificial Reality and Tele-Existence:
The edge points generated by subdivision are only affine combination from the vertices offore-level, and these vertices are vertex points in this level.
