Things get complicated, and not always what they seem. Take the color black for example. Some say that black is not even a color, but the presence of all colors. Some say that black is ugly. The Impressionists avoided using black. Black spots on the skin are probably bad.
At the doctor’s office today, he showed us a CT (or was it an MRI) of the lungs. It was laced with black. Big black lines throttling down to almost nothing. However, the black in the diagnostic image represented clear air passages. For those wanting to breathe easily, black is good.
The immovable gray surrounding the black, squeezing it to a trickle, is the cancer. Hard, like a rock. Everything beyond is choked of air.