A roll of blue painters tape is worth its weight in gold sometimes. However through VBS, Sunday School, etc I've used a normal jump rope as a boundary aswell. If you're outside on pavement or sidewalk others have suggested marking your area with chalk.
I've been swarmed before though (During Balloon Work) mostly due to line cutters... to which I respond by saying as nicely as I can that I have a line of children/people waiting and that their spot at the back of the line will "Magically" (Eventually)turn into the front of the line if everyone cooperates.
I have have only had to change the tone of my voice once in order to get my point across... and that situation was when a older teenager came over to me (cutting line) demanding a balloon .... I inflated one and handed it to him (without twisting) He said " Hey You didn't twist it" I told him that in order to be the recipient of a good balloon sculpture he had to pay me with good maners and patience. I waited on the people that Had been waiting (all of which kindly said please and thankyous) and then waited on the teenager.
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