"The plain man is familiar with blindness and deafness, and knows from his everyday experience that the look of things is influenced by his senses; but it never occurs to him to regard the whole world as the creation of his senses"

This quote by Ernst Mach is suggesting that the typical person recognizes how their senses can affect their assumption of the globe around them. As an example, an individual who is blind or deaf will experience the globe in a different way than someone who is not. Nevertheless, it is not something that the ordinary individual would consider regularly. Mach is recommending that the typical individual does not consider the truth that the world they experience is in fact developed by their senses. He is indicating that the globe we experience is a product of our detects, which without them, the world would be totally various. This quote is a tip to be conscious of how our detects form our perception of the globe, and also to be knowledgeable about exactly how our detects can limit our understanding of the world.