Evolution of sanitation throughout human history, from 'Early civilization and the middle ages Era', to the 'sanitary awakening and advent of water-borne sanitation era', through to the 'waste water reclamation and eutrophication control Era', and possible future 'Ecological sanitation Era'. Source: Redrawn from Gumbo (2005).
To those that present themselves as great thinkers by using complex & important sounding ideas:
"Don't mistake scale for importance or ambition for significance"
"The ordinary is the extraordinary" - Wang Xiangzhai
"Simplicity is the ultimate form of sophistication" - Da Vinci
Proponents of machine learning & neuroscience advocate that the perception of reality is generated by the brain's internal 'world model'. A more interesting view is that its not just perception, but reality itself that is generated, including the perceiver, the brain & spacetime. In this view the challenge is not control and optimization, but cultivation & relaxation.