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First, obtain materials that naturally glow under blacklight. Cotton string and white “batting” (Fabric Store) usually glow bright blue under blacklight.

For the webs, simply run 6-8 lines that all meet in the middle, and then, like a spider, weave additional string in circles, tying it off on the main lines as you go.

Web Sacs aren’t much harder. Start with something for the core. I use a plastic 2 liter bottle for most, and for a human sized version, I use a tomato cage (carefully ensuring no wires could hurt anyone).

Attach a string to the core material, either tying it directly, or for 2 liter bottles, tying the string to an object inserted inside, like a large washer, and running the string through the bottle neck to suspend it (be sure the washer is larger than the opening).

Spider webs and spider sacs are quick and easy to make. If you hang them in the right locations, visitors have to touch them, or actively avoid them... which is a perfect way to divert their attention from another “scare” that you have planned.

You can also make these shake to simulate a spider movement.

For added effect, loop some irregular yarn (also available at fabric store) around the sac, letting it hang off the sides. Not only does this add to the websec effect under blacklight, it also makes for a perfect place to hang a few oversized spiders....

Lastly, you can connect a fishing line to these websacs and make them move throughout the night. I’ve done this manually in the past, but typically hook it up to a pneumatic actuator nowadays. I tie it to one of my sensors, and allow the computer to trigger the compressed air whenever someone enters the area.