12-13-2011, 01:00 AM
I've thought about this quite a bit. A double/triple thickness depth of stacked, used up car/truck tires, filled with gravel or sand should work great. The tires wont shatter like wood, just absorb and then go back to natural shape. They are cheap in most places, too. Easy to make up and define the area you want to use, stack neatly without falling down, etc.
You seek escape from pain. We seek the achievement of happiness. You exist for the sake of avoiding punishment. We exist for the sake of earning rewards. Threats will not make us function; fear is not our incentive. It is not death that we wish to avoid, but life that we wish to live. - John Galt