David Nash's Wooden Boulder

I was recently told about a work by sculptor David Nash simply called "wooden boulder".  It is a 25 year work that featured in a documentary by Welsh film maker Pete Telfer.  It started when Nash was called out to cut down a tree for safety reasons and he had planned on using the boulder he had cut from it in his studio, but instead pushed it into a nearby river where is sat the bottom of a waterfall and he thought it looked like it was in the right place. It then intermittently moved downstream whenever the river swelled and overtime has moved kilometers and is now in the sea although Nash likes to think that it is not lost but rather "it is where it is." He likes the notion that wood that grew out of the ground will finally return to it which i feel sums up the sense of harmony and cycle of nature well.