Jade Disc

Humanities HELP!!!!!!!?
Can some one please help me answer these questions for a crossword puzzel!
mythical creatures found on the jade disc known as “Pi” (its suppose to be 18 letters)
drawing that conveys a sense of three-dimensional space on a two-dimensional surface (12 letters)
wow. The Pi Discs are supposed to represent immortality – 11 letters or stargazing – 10 letters
even Celestial Dragon is only 15.
I’m at a loss on the dimensional drawing with 12 letters.
Sorry.
Maybe repost this question in WordPlay, you may get more help there.
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