Also known asyantrayantras
When a person has no money and cannot demolish or install anything, a simple number yantra written on the wall with kesar using a pomegranate (anar) twig pen balances the element of that zone, and the work starts running.
Wall of the zone whose element is out of balance
The sun's rays take about 8 minutes 20 seconds to reach the earth, and only about 55% of their energy arrives; the other 45% is lost on the way. Of what arrives, trees and plants capture about 95%, mirrors 80%, yantras 60 to 90%, pyramids 65% (which is why fruit kept under a pyramid stays fresh), water 60% (mainly the Moon's energy), metals 45% and stones 35%. Plastic and other petroleum by-products capture none, so interiors should rely on natural materials and on indoor and outdoor plants chosen for the planet of each direction.
Vedic vastu says the defects of a wrongly placed door can be removed through the decoration of the door itself: auspicious symbols, yantras, paintings and artworks made on the door, door power at the threshold, and a bandhanwar (toran) hung on it. This class therefore treats wrong doors with symbols, torans, bandhanwars and colours rather than structural changes.