These solid rocks appear to be floating in an airy substance but are off shore in the Atlantic Ocean about 2 miles from Thunder Hole on the Ocean Drive at Acadia. Taking a long exposure with a dark filter on a cloudy day allows the surf to smooth out a bit and the spray to create neat areas of mist that seem cloud-like.
I really like taking long exposures photos! So, I should be trying some more types.
Acadia National Park