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Geometrisches Muster
You could walk kilometres along a deserted sandy beach. Since I discovered this sand structures.
Man konnte kilometerweit am menschenleeren Sandstrand wandern. Da entdeckte ich diese Strukturen.
Expedition 50 Earth observation composite of the Richat Structure, also known as the Eye of Sahara and Guelb er Richat, in the Sahara near Ouadane in west-central Mauritania, western Africa.
Zoomable version here: www.esa.int/ESA_Multimedia/Images/2021/05/Richat_reassembled
Composite created wtih iss050e070090-iss050e070110.
jsc2017e064007
With geiger-counter on the Lötschenpass. I was there with a geologist, analyzing a special and rare structure containing uranium.