Why does it ultimately make consciousness hard to explain from the physicalist perspective?

Thomas Nagel, Bats, and Subjectivity

Critique of philosopher Thomas Nagel’s paper, “What Is It Like To Be A Bat?”

Thomas Nagel argues that there is something especially difficult in characterizing and explaining consciousness.

What is Nagel’s characterization of consciousness? How does Nagel relate consciousness to points of view?

Why does it ultimately make consciousness hard to explain from the physicalist perspective?