The magical plasticity of authenticity

Acting the part is no longer an act of imagination, apparently. But real life is

There’s currently a rash of actors saying they shouldn't play characters who are different from them in gender, sexuality, race or disability. This has rightly been held up to ridicule. 

The screenwriter Aaron Sorkin is reported in the Sunday Times as being angry at criticism that, in his new film Being the Ricardos, he has cast a Spanish actor, Javier B…