sorry guys, I should have made it clear.
I did not design these things. I noticed some patterns as I was analyzing data for something else. Then I dug a bit deeper.
To my eyes, it seems the peaking of blue line corresponds or precedes a local market top, whereas the peak of red line corresponds or precedes a local market bottom.
These indicators may somewhat correlate with market sentiments, although the correlation is not exact. But currently available sentimental indicators aren't that great either.