When you bought your house, only 5 commercial planes passed over it daily, on average. That number has grown slowly and almost imperceptibly over the intervening years, and now numbers 150. Is the change from 5 to 150 a drastic or radical change? Is your situation with 150 planes flying over your house each day more tolerable because the number increased slowly and imperceptibly? Would you be more likely to receive compensation of some sort if the changes had occurred over a very short period of time? Does the fact that we can't tell which straw broke the camel's back mean that the addition of more straw to the camel's burden was not the cause of its broken back?