How literal is this phrase?

Sample examples at http://tinyurl.com/is-it-lit

cloud nine:

Definitions:

  1. a state of extreme happiness

Examples:

  1. her to do any more work that night was an impossibility ; she was on cloud nine ! ” remembers Fenia . " Jill was not only a genuine and natural warm
  2. sat in . ljayrod@aol.com rs-ford 's comments : Looks good ... you must be on cloud nine !!! looks really good on the grass where did you find the same shade as
  3. with nature Ladybirds ; they do n't make a meal of aphids UEA team on cloud nine Compost is not just a load of old rubbish Storm forecasts have real value Volcanoes
  4. Date : 26 - 0 9 - 2005 Posts : 1,403 Location : Presently on cloud nine ! wow how exciting girls ! sharon , just to dispell a couple of myths
  5. AND tickets for an air boat ride in The Everglades . Wow ! Still on cloud nine , the next morning I answered the phone to a man who quizzed : "

Note: Please select the answers below carefully based on the definition which occurs frequently in the examples

Step 1: score of 0-5 for how literal is the use of "cloud" in the phrase "cloud nine"
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Please provide any comments in case you want to tell us about your judgement or any other queries/suggestions! Not Mandatory but helpful.