1970's Window feature design

The attached window design feature:
Casement windows encased by a distinct rectangular `protruding' enclosed brick shape sloping design was popular in the early 1970's.
Many semi-detached and bungalow homes both in Singapore and Malaysia feature such an iconic design. Slowly as many owners redesign or do A&A works, such designs are disappearing gradually.
As often, such homes are considered relatively "new" i.e. 30 to 40 years old and not worth conserving, yet.
From a Feng Shui point of view, it is a stable design as rectangle represents the earth element. While circle designs during that era (1970's are rare and least desirable for large window openings).
Often, the top ledge because it is broader, there; is a haven for birds / birds nest. Thus perhaps thanks to such a design, many birds happily started a family there - once upon a time...