Technical requirements for stage and stand-up
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Optical illusion after Jerry Andrews
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The dragon was originally for our Brain-Busters theater program.
watch at youtube
Click on the picture and look in the spiral for 10 seconds without blinking and then look e.g. on the back of your hand!
Book Stefan Sprenger
A magic-pen was put on their buttonhole, here you can find out how to free yourself!
the explanation