Wahdat Al-Shuhud
Wahdat al-Shuhud (or wah-dat-ul-shuhud, wahdat-ul-shuhud, or wahdatul shuhud) has often been translated into English as Apparentism. In Arabic it literally means "unity of witness", "unity of perception" or "unity of appearance"..
Out of those who opposed the doctrine of wahdat al-wujood, there were those who substituted the pole of subject for the object, formulating the doctorine of Wahdat ul-shahood. This school was formulated by `Ala al-Dawlah Simnānī, was to attract many followers in India, including Ahmed Sirhindi who provided some of the most widely accepted formulations of this doctorine in the Indian sub-continent.
According to Ahmed Sirhindi's doctrine, any experience of unity between God and the created world is purely subjective and occurs only in the mind of the believer; it has no objective counterpart in the real world. The former position, Shaykh Ahmad felt, led to pantheism, which was contrary to the tenets of Sunnite Islam. He held that God and creation are not identical; rather, the latter is a shadow or reflection of the Divines Name and Attributes when they are reflected in the mirrors of their opposite non-beings (a'dam al-mutaqabila).
Abu Hafs Umar al-Suhrawardi and Abd-al-karim Jili were also proponents of apparentism.
Read more about this topic: Wahdat Al-Wajood