"he used his computer to make a collage of pictures superimposed on a map"
"a collage of memories"
1.(用彩色纸片、布块粘贴而成的)拼贴画
Acollage is a picture that has been made by sticking pieces of coloured paper and cloth onto paper.
2.拼贴艺术
collage is the method of making pictures by sticking pieces of coloured paper and cloth onto paper.
3.(风格、特性迥异的事物构成的)大杂烩
You can refer to something that has been made by combining a number of very different things as acollage of a particular kind.
e.g. Rego's work is a richcollage of 20th-century painting styles.
瑞格的作品糅合了20世纪各种绘画风格。