John Davis saw a giant rootball unearthed in a tornado 27 years ago and decided to dig out the roots and make a sculpture out of it. After 2 1/2 years he was finished revealing the 14 foor-by 16 foot, 3000-pound piece. Then he listed it on Ebay for $2.7 million and got no offers. Now he wants $600,000, but the artworld doesn’t seem interested. “From the photograph, it looks like an incredible object. A question that I’m asked a lot is, ‘What is it really worth?’ And there are different qualifications for intrinsic artistic value and what the art market will bear. … On the art market, it’s worth whatever someone is willing to pay for it.”