Some classical examples are Crystals, Pyramids, Vedic Yantras, Sacred Geometry, Maha Meru, Pancha
Some classical examples are Crystals, Pyramids, Vedic Yantras, Sacred Geometry, Maha Meru, Pancha Boodha Stupa, Vajra, Viswa Vajra, Rahu ( Dorje Phurba ), Fengshui Objects, et cetra.