It's another one of those mysterious ones - don't know the location and certainly don't know when it was taken down. I do know that it is sometimes referred to as 'Forest Traveller', but beyond that, well.

 

The picture is an old archive shot of low quality, so even if you squint it's tricky to work out what you're looking at. It's recognisably a Ken Turnell piece though. Take a look at his others, particularly 'Forest Flight', and you'll see a clear resemblance.

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Also by this artist:

Beech Watch 1978

Forest Flight 1978

Sawrey Bank Watch 1978

The Eye 1984

Wall Relief 1984