Bendy blades on wind turbines

Just thought I'd share this photo which shows how much the blades bend in the wind.

The turbine closest is turning at a fair speed.  The one further back isn't turning.  

Similar to helicopter blades, they go all over the place when seen in slow motion - they flex along and across their length. That's why we're told to stoop when entering and leaving them. Quite amazing engineering.

We met one of the engineers up there once.  I thought the blades must be made of some really fancy high-tech gubbins to be able to flex like that, but he told us they are wood with a fibre-glass coating.