Subtlety

The differences between "overt" and "subtle" can be discussed in various ways. One is through the prism or racial bias. I read that Dr. Martin Luther King, Jr., was deeply frustrated when he shifted from battling overt Southern racial discrimination to battling subtle Northern racial discrimination because the subtle Northern discrimination was more entrenched and intractable. This shows that what is more hidden in the subtle can therefore make it that much more formidable, whether it is subtle arguments or subtle racial bias.