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Il sole sembra bucare la montagna: i raggi passano attraverso una fessura nella parete rocciosa nel massiccio del Gastlosen, nelle Prealpi friburghesi. È il fenomeno conosciuto come "Grossmutterloch" ("buco della nonna"), visibile per pochi minuti al giorno, tra novembre e febbraio, nei pressi di Jaun.
La leggenda vuole che all'origine della crepa ci sia il diavolo, il quale avrebbe scagliato la propria nonna contro la roccia in un momento di rabbia. La spiegazione scientifica è legata alla geologia: la parete è costituita da strati di calcare che sono stati compressi e trasformati milioni di anni fa. In un punto di intersezione tra questi strati si è creata un'area più fragile dove, in seguito all'erosione, si è generata un'apertura.
ATS/eb
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