Though cognitive scholars have made some attempts to take on board the idea that different languages have evolved radically different concepts and conceptual metaphors, they have on the whole remained tied up in the somewhat reductive concept of worldview which derives from the Sapir-Whorf hypothesis . The true source of ethnolinguistics and the thinker who contributed most to the debate on the relationship between culture, language, and linguistic communities was the German philologist Wilhelm von Humboldt (1767–1835). Humboldt remains, however, little known in English-speaking nations. Andrew Goatly , in "Washing the Brain" (John Benjamins 2007) does take on board the dual problem of conceptual metaphor as a framework implicit in the language as a system, and the way individuals and ideologies negotiate conceptual metaphors. Neural biological research suggests some metaphors are innate (as demonstrated by reduced metaphorical understanding in psychopathy). 
In each our examples so far, a wall blocks something. Does it always block something? Can it ever block everything ? What if it blocks nothing ? What if it sometimes blocks something ? Following the same process as above, try to find an answer to these questions using wall metaphors (for example, "a door is a sometimes wall" or "a hole is a nothing wall"). Then use your answers to create new metaphors, observations and questions (for example, "a heart valve is a door for blood" or "a security hole is an open door for intruders").