The 1990s fashion emphasized individuality and variety over specific trends. Hairstyles included short hair in brown or blond for girls, and zig zags or tupe cuts for some guys inspired by rappers. The blockbuster films Independence Day and Die Hard 2 were released, involving alien invasions and Bruce Willis' character John McClane. Grunge band Nirvana and rock group Nickelback formed in the late 80s/early 90s. Dolly the sheep was the first mammal cloned from an adult cell in 1996. The Leaning Tower of Pisa began tilting upon construction and safety measures were taken in 1990.