So a military force has no constant formation, water has no constant shape: the ability to gain victory by changing and adapting according to the opponent is called genius.
Even a vortex is a vortex in something. You can't have a whirlpool without water; and you can't have a vortex without gas, or molecules or atoms or ions or electrons or something, not nothing.
How doth the little crocodile Improve his shining tail, And pour the waters of the Nile On every golden scale! How cheerfully he seems to grin, How neatly he spreads his claws, And welcomes little fishes in, With gently smiling jaws!
There is seven-eights of it under water for every part that shows. Anything you know you can eliminate and it only strengthens your iceberg. It is the part that doesn't show. If a writer omits something because he does not know it then there is a hole in the story.