Bishan New Town became the first in Singapore to depart from the brutalist design seen in most previous Housing and Development Board (HDB) towns. Instead of slab-like residential blocks that were built in uniformed rows, apartment blocks in Bishan varied in height and were often dislocated. Flats within the town also featured pitched roofs which have since become closely associated with the skyline of Bishan. The town is also home to three of Singapore's most prestigious educational institutions, Catholic High School, Raffles Girls' School and Raffles Institution.