velcro strips. to attach the velcro strips there is styrofoam construction adhesive.
Depending on size, covering materials, location, age of kids...
Have you ever seen styrofoam catch light?
You may want to rethink its use as a playstuff... It's probably safe in most locations, but model a worst case scenario and think it through carefully.
Yes, the modified material burn until you take the heat away and then it goes out. It won't sporadically start to burn. In tests by Factory Mutual with a burning wastebasket, it proved safer than wall paneling.
I'm thinking those stick-on picture hangers and elastic bands...
I agree with the velcro idea but make sure you use the industrial grade stuff.
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