Meditation is an important part of Japanese culture, especially Zen Buddhism. Samurai warriors followed Zen Buddhism and were led by Zen monks and nuns. Monks and nuns follow strict rules, meditating daily from 3:30am, and are not allowed distractions even from insects. There are many styles of meditation, including Zazen where monks clear their minds while sitting rigidly. Zen gardens are also objects of meditation, intended to leave deep impressions and suggest religious themes through natural beauty.