龙形(xíng )象(xiàng )的(de )多变性(xìng ),主要(yào )缘于龙的幻想属性。商周时(shí )期龙的形象尚(shàng )未固(gù )定。《管子·水地》称龙“欲小则(zé )化如蚕蠋(zhú ),欲(yù )大则藏于天下,欲(yù )尚(shàng )则凌于云气,欲下则入于深泉,变化(huà )无日,上下无时(shí )。”《说文·龙部》也(yě )云“龙,鳞虫之(zhī )长,能幽能明,能细能巨(jù ),能短能长。春分而登天,秋分而潜渊(yuān )。”这些记述与商(shāng )周青铜器(qì )上龙(lóng )纹复杂多变的形(xíng )象是相合的。
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