The four dharmadha^tus， or four realms of reality as explicated by the masters of the Huayan school: （1） shi fajie 事法界 the realm of individual phenomena; （2） li fajie 理法界 the realm of the one principle （/su^nyata^）; （3） lishi wuai fajie 理事无碍法界 the realm of non-obstruction between principle and phenomena; （4） shishi wuai fajie 事事无碍法界 the realm of non-obstruction between phenomena.