 Nyingma’s defence of the definition (2) also has two premises. The first one comes from its theory of error, the most commonly used by the Nyingma philosophers. According to this theory, conventional truth is, as matter of fact, an error confined to the ordinary beings (so so skye bo) who are blinded by the dispositions (bag chags) of confusion (ma rig pa). It is argued that under the sway of confusion the ordinary beings falsely and erroneously believe in the reality of entirely unreal entities and the truth of wholly false epistemic instruments, just like the people who mistakenly grasps cataracts and falling hairs to be real objects. Conventional truths are mere errors that appear real to the ordinary beings, but they are in fact no more real than the falling hairs that are reducible into the “modes of apprehensions” (snang tshul) (Mipham Rinpoche 1993c: 3, 1977: 80–81ff, 1993d: 543–544).