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How to do a ledge drop off effect?

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I was at a haunt last year and saw an this effect and have been trying to figure it out since. I know it worked off of a similar set-up to the bottomless pit, there was a small shack on the path that you had to enter, immediately upon entering you are put onto a 'ledge' that continually shrinks...on the other side of the ledge it appears to drop off to an endless pit, however you realize that when you step down that it actually is a surface (mirror I believe) that you could walk on and that the bottomless pit was just an illusion. I didn't really get a good look at the works behind it at the time, but I made a diagram of how I think it may work (although i could be totally wrong). Any help would be great, I'm thinking of doing a smaller version of this for our haunt here.

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bottomless pit ????

I also have questions on how does this work. I have started my bottomless pit, and have mirror and acrylic. I have to bend heavy cardboard in circle. I have made the top edges of cardboard jagged painting it black and was adding debris. I could not find anything else big enough round. my mirror and acyrlic are about 25-26 inches round. I have not attached film on acrylic yet. I am probably going to need help, some things look easier than they are. So I can't try it yet. I want to do this pit inside,the house. I was told it would not work uness I have something covering the top part of it in black. It will just show ceiling which is white. I did not even think of that when I started. Do I have to attach this on a tilt in base and face something black? I am going to use those L brackets all around inside and set mirror in. I did not even think of that when I started. I am trying to make it like a project exploded and put a hole in the floor. Thanks
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