Drawing your levels in this manner gives you a better reference point to look for
signals from since you are getting closer to the mean or average turning point price in the market, so it's basically a higher -
probability level
than a level that's further out but exactly at a bar high or low.
To elaborate slightly on my above point, the cause / effect relationship between CO2 and temperature derived from data spanning more
than 400 million years, and operating within uncertainty margins that can be quantified with reasonable
probability requires the existence of a prominent CO2
signal in the record of the past half century.