#barrier.obstacle  any condition that makes it difficult to make progress or to achieve an objective; "intolerance is a barrier to understanding"
  supertype:  #obstacle.deterrent__obstruction  something immaterial that stands in the way and must be circumvented or surmounted: "lack of immagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan"
  subtype:  #ideological_barrier__ideologicalbarrier  a barrier to cooperation or interaction resulting from conflicting ideologies
     subtype:  #iron_curtain  an impenetrable barrier to communication or information especially as imposed by rigid censorship and secrecy; used by Winston Churchill in 1946 to describe the demarcation between democratic and communist countries
     subtype:  #bamboo_curtain  an ideological barrier around communist China especially in the 1950s and 1960s
     subtype:  #color_bar__colorbar__colour_bar__color_line__colorline__colourline__Jim_Crow  barrier preventing blacks from participating in various activities with whites
  subtype:  #language_barrier  barrier to communication resulting from speaking different languages

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