Ending an exhibition can generate problems. You can use a visual metaphor to strengthen the final. I have used PowerPoint's gradient fill and animation facilities to generate a strong visual metaphor in relation to red velvet curtains in a homage to Baz Luhrman's Moulin Rouge. Closing a talk can be http://thelotterynumbergenerator20739.bleepblogs.com/3178156/how-to-make-curtain-animation-in-powerpoint-gradient-fill-and-animation-consequences