On art as a mind-opener see de Botton 2013, p. 44-45. *** Some pieces of art will trigger your defense mechanisms. Being aware of that is important as this reluctance towards this kind of art can showcase cognitive biases, traumas and so on that would be otherwise deeply hidden in your subconscious. This is usually the signal that you should ready up your scout mindset and engage with this kind of art specifically and strive to understand what's so important about it for some people.