"Son of man, you live in the midst of the rebellious house, who have eyes to see but do not see, ears to hear but do not hear; for they are a rebellious house." ~Ezekiel 12:2 (New American Standard Bible)
A good portion of learning I-Liq Chuan is learning to recognize what you are seeing. It is not that the advanced practitioner has achieved some mysterious power or superhuman senses. Rather it is something much more mundane: they have better control of how they perceive reality. Sifu uses the analogy of learning to be like a receiver, specifically an FM radio. The information (radiofrequency waves) is already out there and the antennas are up, but information from the radio waves is not clear until the frequencies are tuned in. Everybody receives information through the same senses, but not everyone tunes in as effectively to perceive what they are actually sensing.