I didn’t see this described, but OM is taken into account the primary seem of creation in yoga custom, correct? Would make me need to chant OM while watching my Yantra! Repeat a mantra, like “Om Namah Shivaya,” or just recite the names in the deity associated with the yantra. https://felixdkouu.suomiblog.com/the-ultimate-guide-to-sadhna-55128622