How literal is this phrase?

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

brick wall:

Definitions:

  1. # An obstacle.
  2. $ a wall built with bricks

Examples:

  1. of the merits of the case . The 3 month limit though is not a brick wall , if circumstances demand an extention of time , then it is in the discretion
  2. 1975 . A couple of years later another female who apparently vanished on reaching a brick wall , was observed near Traitor 's Gate . Top WESTMINSTER ABBEY Victoria Street London SW
  3. the landward side but sloping down steeply to a wooden door set in the high brick wall to seaward . " 7 Tower 28 is recognisable not only from the above description
  4. for some time been aware of the outline of a structure in the form of brick walls at ground level . It was not until the end of April this year that
  5. ' back , but we wont get them back by battling against a ' yellow brick wall ' . Talking of ' exclusive clubs ' thanks to Jes for getting me into

Step 1: Select the definition of brick wall which occurs most of the times in the above examples. Ignore other definitions.

Definition1 Definition2

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

Step 2: score of 0-5 for how literal is the use of "brick" in the phrase "brick wall"
0 1 2 3 4 5

Please provide any comments in case you want to tell us about your judgement or any other queries/suggestions! Not Mandatory but helpful.