Text in finnish, but pictures are self-explanatory. Borders are foamboard. That is board which has urethane fill in the middle and top layers are cardboard. Fences are cardboard. These are easy to build with minimal cost. You can strenghten the structure by using long nails to bind cardboard fences to foamboard borders. Top of the fence (black part) is soft self-adhesive sealant rubber. These are modular and re-useable. I have used this kind of border-fences in several events like this one
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