There are 4 main directions in Vastu EAST, WEST , NORTH & SOUTH and 4 sub-directions or the corners at which the main directions meet namely NORTH-EAST , NORTH-WEST SOUTH-EAST , SOUTH-WEST . Each main Direction in Vastu Shastra has its own significance in vastu Shastra and the corner directions retain the characteristics of the two sides they join along with their own characteristics. Also As per my analysis the 4 sub directions have more importance that the main direction. Vastu Shastra essentially Deals with the positioning of the House/ office / factory along with other objects and rooms and various other things in any place according to the above mentioned directions.
The Arrangements of the Rooms and other objects if done up as per the proper directions in accordance with VASTU SHASTRA ensure proper flow of positive energy throughout the Home or office or any other piece of land and influence the lives of its inhabitance in a very favorable manner.