There are different ways to tell stories. One way is to put the end first. This is one of those stories.
Do not use the concave form. You are not worthy.
The concave form is only valued by viewers. Unless you, personally, can add a valuable pixel to the screen of
http://www.milliondollarhomepage.com/ then you have reached a focal point. Enjoy it and explore that point's focal plane.
The concave form is powerful because it gives the viewer the sensation of punching someone in the chest. That is why weak viewers want it. Do you want to sell to weak viewers? No. No one wants weaklings.
So do not use the concave form unless you want to be punched in the chest. You have to want that punch like artists do. If you can survive that then you can give the concave form the dimensions and name that it deserves -- theater.