Tips for creating a giant boulder like the one from Raiders of the Lost Ark?

Me and my friends are considering doing an Indiana Jones movie, but we haven't really come up with an idea on how to create a giant boulder in a cheap and easy way. I was considering buying a giant beach ball and covering it with paper mache, but the prices ranged too high. Anyone have ideas as to what we can do?
Tips for creating a giant boulder like the one from Raiders of the Lost Ark?
Chicken wire and papier mache! When I was in high school, we had a tradition of making parade floats for our homecoming game. One year, we made a 6-foot tall dragon's head out of chicken wire, then covered it with papier mache and painted it. It was sooo amazing. (Another year, we made a 6-foot astronaut, which was also pretty damn cool).





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Then again, if you get hit with a giant, hollow ball of chicken wire, it'd probably hurt, lol.





I think your best bet is going to be a beach ball or something equally large. Keep in mind, though, that it'll probably take a week before it's ready. You'll have to put on the papier in stages and wait for it to dry i between. PLUS painting it.





I'll probably look really cool when you're done, though, so if you're dedicated I'd say go for it!
Tips for creating a giant boulder like the one from Raiders of the Lost Ark?
You could try papier mache
Reply:If a $4 giant beach ball covered in papier mach茅 is too expensive for you, I doubt you're going to find much else that is cheaper. You could always photoshop a giant bolder into each frame of your film, but with the time it would take you to do that, you're better off buying the beach ball.
Reply:Anything big is going to cost time or money or both. And unlike the sculptures on the float, your boulder is going to have to roll and not get damaged from its own weight, which paper mache is notorious for doing. Whether it is obvious or not, the boulder in the movie was braced inside and was supported from in back - it wasn't just let go - by using a close up camera angle an axle through the middle and yoke behind would keep it from destroying hundreds of thousands of dollars in equipment and a couple of million in actors. Also, optical processing would eliminate accidental views of the hardware. It was probably made of fiberglass.


Instead of copying, use your imagination and put something on skids or wheels that can be pushed/moved by someone inside/behind. Think of the mass of a loaded refrigerator (pushed empty) or a vehicle rolling out of control (but controlled for safety)
Reply:Styrofoam, glue, and spray paint. Use flat sheets of styrofoam, cut them and glue them into a hollow form. It might be helpful to have a metal mesh form to use a structure/frame work but that will add weight. If you take your time you can use a many many many faceted piece to make a very authentic looking rock.





You can pick up styrofoam from a hardware store. Get some thin stuff, like 1/2" or so. You can pick up an 4x8 foot sheet for 2 or 3 bucks.

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