Looking like a weird giant owl or a Dalek out of Doctor Who from this angle, it is in fact the retired second order Fresnel lens of the Punta Cumplida Lighthouse at Santa Cruz in Tenerife. If you click on the orange text you can find out about the boffin stuff. I just thought it looked interesting.
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Nice! I can’t think if too many people who can combine a Dr Who reference and a lighthouse reference and make sense. Kudos!
Thanks Buck, deep down I’m full of sci-fi! Exterminate……!