PARIS — Some designers like their fashion straight up, but Christian Lacroix isn’t among them. For him, the couture has its own brand of magic, ideal for his rich imagination. His spring collection featured unexpected juxtapositions of colors, shapes and patterns, infused, of course, with more than a touch of lyricism. Here, one example: a long, sheer, pleated dress worn with a wisp of an evening coat and an ornate belt. For more on the season, see pages 6 and 7.