For those who prefer simple worship of a Yantra, traditionally a small lighted oil-lamp or ghee lamp placed in front of the Yantra is regarded as the best form of simple worship. The lighting of incense of various types is also well regarded as is the auditory stimuli of chanting Mantras or playing tapes of sacred chants. As Yantras are living energy systems, they respond to all sensory stimuli. Perfume is perceived as a vain affectation and is to be avoided especially as most perfumes consist of synthetic components