Over the Falls
The top of the piece is the turbulent moving part of the wave and the bottom/base is the sand below with the kinetic element being the "washing machine" affect when you've bin rag dolled from a massive wave.
OTF explained -
"Over the falls" in surfing refers to a situation where a surfer loses control and gets caught by a wave, causing them to be swept over the crest and down the face of the wave. It can be challenging and potentially dangerous, as the surfer may take a turbulent, uncontrolled ride.