Using the analogy of a lake, deep movement involves moving down through the water, whereas skim movement involves skimming across its surface. Deep movement is much less visible as it occurs below the surface. Skim movement operates on the surface. It gives the impression of 'great' movement as it skims rapidly across, unencumbered with much necessity to interact.
Skim movement is bold, sweeping, exciting, colourful, full of surface energy and heat.
All flash and no substance'. Deep movement can be seen as stodgy, boring, unadventurous, stuck in the mud. However, deep movement can also be seen as having a purity of purpose. The surface may be still, but as the saying goes, 'still waters run deep'. It is my feeling that modern Western culture exhibits far more skim than deep movement.