If you are playing King Lear you are the centre of attention anyway. You don't need to draw attention to yourself. It's all laid out for you.
When I was playing Gandalf, I didn't think, 'Oh my dear, I'm playing a 7,000 year old wizard,' because I've never met one, and I don't know what they're like.
'King Lear,' I've been seeing all my life. I mean, the great actors of my lifetime... to join their company, as it were, by playing a part that's challenged them, is one of the great joys of being an actor who does the classics.