The first thing you notice about a New Day shelter is its shape.  Many things are optimized by a round footprint including strength and space-efficiency. 

For years I produced rectangular storm shelters, and there's nothing wrong with that, lots of companies do. But in 2008 it occurred to me that we could get more shelters into garages if the shelters were not so bulky.  Space-efficiency is very important in the place where we put our cars and loads of other stuff.  Many times I have placed this concise, round safe room where no other design that I know of could have properly fit.