I didn't pluck 16 out of thin air you know.
:P
The whole Eden Project site is ~450m² - most of which is outdoor gardens and assorted buildings - the two biodomes are only about 1/6th of that space combined.
The largest dome is 55m high.
Bedrock = 0..4, sea level = 64 and invisible ceiling = 128
The reason for dropping 16 is:
a) to stop the tip of the big one from reaching cloud level and looking crap.
b) the site is an old quarry, so is actually in a dip in the ground anyway.
Technically, to be accurate, we should probably be around 30..40m
above sea level, and then drop a certain amount down from that - but that's probably taking things a bit too far.
:)EDITED: 9 Mar 2011 21:03 by BOUGHTONP