According to Osho, when nothing is perceived, witnessing remains as objectless, impersonal awareness—no 'witness' as a person, only pure witnessing, like a flameless light or cloud of isness. With the ego absent, a non-individual joy and serenity arise. This empty, centerless consciousness—nirvana—is the buddha-nature itself, timeless, unborn and undying.
When there’s nothing to see, what’s left is just clear knowing happening by itself—not you watching, just watching.