Earth energy or the energy released by earth or land is called Vastu Purusha, where 'Vastu' is the land or place & 'Purusha' is the energy of that place.
A vacant plot has free flowing energy which is disturbed to a great extent by construction of walls,doors,windows,etc (not following the rules of vastu).This disbalance of energy causes disturbance in the natives life which can be rectified by Vastu Shastra.
