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about observing an object in the present moment (T_now), then one can expect the present moment to occur randomly between the start (T_start) and the end (T_end) of the observed object's longevity. Therefore, the total longevity of an observable object can be expected (with 50% confidence) to lie in the interval 1/3 · T_start < T_{now < 3 · Tend. This estimation technique was derived after a 1969 visit to the Berlin Wall, which was constructed eight years earlier. Gott reasoned that there was nothing special about the timing of his visit, so the above equation (with T = 8) estimates that the Berlin Wall would be likely to last for at least 2.67 years but no longer than 24 years. (The Berlin Wall fell 20 years later, in 1989.)}

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