The crucifixion with angels and mourning figures is related to which early medieval culture or period?

Through the 870s and 880s in European or Carolingian culture, angel crucifixion and mourning was commonly used to evoke the pressence of God or Jerusalem. It frequently used repousséd gold and gems. A popular example is the Lindau Gospels. 

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every detail in an artist's work conveys a message. from the palette of paint colors chosen, to the strokes of the brush, to the quality of canvass and the synergy of the whole art. bright colors may entail vibrant and positive feelings while dark colors convey gloom or sorrow.