How would you say "shades of gray" or "subtle differences" on Spanish? I was talking with a friend who is a Spanish speaking (1st language/primary Language/ weak English). We were talking about concept or idea of life's subtle differences, I said those are "shades of gray" in that life's solutions are not binary. Using the word binary was not good as an example because, she did not have a technical background from which both binary and shades of gray derive. How might you express this in Spanish either as "subtle differences" or "shades of gray" ? Preferably both.