No, that's not what he said. What he said is that people can be blind for a long time. That it is not correct to assume that if there is a big bubble people wi

No, that's not what he said. What he said is that people can be blind for a long time. That it is not correct to assume that if there is a big bubble people will notice it immediately. It is useful when it prevents you from assuming there are no huge bubbles around because if there was one somebody would notice it already.