next time in a pool, move your hand at an angle across the surface. As it starts to move say assuming a motion from left to right, and viewed from above... with a slight positive angle to the direction of motion, a vortex will be seen behind the trailing edge location at the start of movement, and for this example it will rotate clockwise, counter to the bound vortex flow that exists around your hand. Newtonian physics indicates that the bound vortex is therefore equal & opposite, being counter clockwise. When your hand stops (a flat plate is easy to use..) a vortex is shed of the leading edge. IMHO the demonstration is the simplest analogue to explain bound vortex and the development of lift without reverting to a physical model that relies on anthropomorphic desires of molecules as the Bernoulli theory of lift needs. vortex theory is also consistent with the flow around multiple elements. Same visualisation from a tea/coffee cup, or a bowl of soup etc... Add pepper for the tomato soup case, and you have a nice little visualisation tool, use spoon then not hand, "Liquid may be Hot..."