The 1979-1980 theme was a series of jewelry and beauty accessories built out of LEGO bricks, especially plates. The 1997-2001 theme focused on doll-like Scala Figures, their homes and interests.
An unusual feature of Scala sets released in 1997 and 1998 was that many of the bricks didn't feature regular studs. Instead, sets of four studs were combined into an arrangement that resembled a flower. Only some regular bricks could be attached to these flower-studs. In 1999, Scala returned to ordinary studs.
List of Sets
Please see Category:Scala sets