This is the same flower plant pictured above, only I took this picture on my way home a few hours later. I wonder why its petals have closed up.

After doing some research, I learned that it's natural for chicory flowers to close and lose their bright color as midday approaches.

Source: https://www.natureinstitute.org/article/craig-holdrege/a-day-in-the-life-of-a-chicory-flower#:~:text=Soon%20the%20insects%20are%20gone,daylight%20reaches%20its%20greatest%20intensity.