My spin on the MLK monument in Washington, District of Columbia, is that it got its inspiration from the one on Mount Rushmore.
They never finished Mount Rushmore. Budget cuts. WW II.
Washington and Lincoln were supposed to get sculpted down to their hands or waists.
In a way, MLK did not make it to Mount Rushmore, where the world would have put him, and probably not by all the domestic audience.
If MLK cannot go to the mountain, then the mountain must come to MLK.