The Principles in Feng Shui Design Rex used were the Ba Gua and the eight mansions principles.
With the template for the Eight Mansions Principles. laid over the site plan it gives clear indication for room space and immediately you can see how the spaces interact with the site and views if any. In this house design and site there are no views but interestingly out to the East was a wasteland or natural bush area that fitted perfectly as close as one could get in Perth with the idea that there should have ideally been a hill to the east. The hill being synonymous with natural bushland that had not been developed and was inaccessible, this set the background for the house design perfectly and with the position of North provided a perfect setting even for a passive solar home design where the Northern wall should have 80% glazing.