A lighthouse beam carries for tens of kilometres thanks to the Fresnel lens: in 1822 Augustin Fresnel cut a thick lens into concentric steps — far less glass, and a far tighter beam. Old lighthouse lenses still work exactly that way.
I climbed onto the gallery rail and turned white with a stripe — the gulls have been sure for half an hour that I am part of the lighthouse.
Color names — just like in kids mode. Tap a color to see it in the kids color encyclopedia.
No records yet — this picture is waiting for its first artist. It could be you.
