Physiological Wall
In marathon running a runner can 'hit' 'the wall'. A point where the human brain and body feels like it cannot be pushed further or continue. Runners find this incredibly hard to break through and continue.
A wall can also refer to something that the human mind is blocking or hiding from memory but this is debatable.
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Famous quotes containing the word wall:
“The writer in me can look as far as an African-American woman and stop. Often that writer looks through the African-American woman. Race is a layer of being, but not a culmination.”
—Thylias Moss, African American poet. As quoted in the Wall Street Journal (May 12, 1994)