The Greatest Possible Door

Anselm said that the greatest conceivable door, qua door, exists in the mind. But how can we make it a better thing? Because now we're just talking about thingness. So if you define either the being or the door as something that has existence as part of its definition, then it does follow that the greatest possible version of that does exist in reality. If you don't have that baked in, as you were saying, then you can have it. The greatest possible Sherlock doesn't have to have necessary existence. I would say the door, if you've got a concept of a door, and it's just some concept in your mind, it's not something that