Perseus shield. Perseus then proceeded to the Gorgons' cave. In the cave he came upon the sleeping Medusa. By viewing Medusa's reflection in his polished shield, he safely approached and cut off her head. From her neck sprang Pegasus ("he who sprang") and Chrysaor ("sword of gold"), the result of Poseidon and Medusa's mating. The other two Gorgons pursued Perseus, but, wearing his helm of darkness, he escaped. From here he proceeded to visit King Atlas who had refused him hospitality; in revenge Perseus turned him to stone. On the way back to Seriphos Island, Perseus stopped in the kingdom of
Bert van Sprang Bert van Sprang Bernardus Wilhelmus Maria "Bert" van Sprang (20 June 1944 in Tilburg – 17 November 2015 in Pijnacker) was the founder of the Dutch youth division ("JWG", or "Jongerenwerkgroep") of the Dutch association of meteorology and astronomy ("NVWS", or "Nederlandse Vereniging voor Weer- en Sterrenkunde") in 1967. Activities carried out by Van Sprang for the JWG included the organization of astro camps, the setting up of a program to build telescopes cheaply, and the writing of many booklets on astronomy topics. He was also program leader of the planetarium in The Hague until it was destroyed by fire