Wouldn't it be great if your dog could follow your hand to find his dropped or fallen treats, retrieve unseen distant objects, and select between objects etc?
While most dogs learn this skill on their own as you train other behaviors, why not make it as easy as possible for your dog to succeed and teach this on its own? It's a fun mind game to teach on rainy or cold days or dogs that are laid up due to surgery. You can use toys and other small objects instead of food. It's a great skill for goofy dogs that can't focus too!