http://www.jimmys-adventures.net/hiking-diamond-head-honolulu/

Why can’t you see moving waves moving at only a few hundred feet?
I remember hiking Diamond Head in Honolulu, Hawaii. It’s only about 700 feet above the ocean, but looking down you can’t see the waves moving.
They seem to sit there frozen in time, why is this?
the image creation in brain is like Pin hole camera concept. Main thing is that It light reflection because of which image is created. lesser the amount of light, blur the image is created.
less light is reflected from the see or any object that had characteristics like glass. You may have seen people smashing their head on the door make up of glass in the add. or in the real May be this is the reason or it is Optical Illusion.
Diamond Head Hike