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Added: 2026-06-07

[00:00:00]Invisibility, real absence or limit of perception. In chapter 7 of the second part of The Book of Mediums, Allan Kardec addresses the theme of invisibility. He questions whether a spirit could become invisible or if in certain cases something present could simply go unperceived. The first reflection is fundamental. Not everything that is invisible ceases to exist. Modern science demonstrates that most of the universe is composed of elements that we do not see directly.

[00:00:26]Radio waves, magnetic fields, infrared and ultraviolet radiation are beyond the natural perception of our senses. The invisible, therefore, is not synonymous with non-existent. Kardec proposes that spirits, being of a more subtle nature than dense matter, would normally be outside the human perceptual range. Only under specific conditions could they become perceptible. But it is essential to distinguish hypothesis from proof.

[00:00:50]From the current scientific point of view, there is no replicable empirical evidence of the invisible presence of conscious entities independent of the body. On the other hand, the psychology of perception teaches something important. Our vision is highly selective. The brain constantly filters stimuli. There is a phenomenon called inattentional blindness in which visible objects cease to be perceived when they are not part of the conscious focus.

[00:01:15]Furthermore, our perception depends on reflected light. If there is no proper light interaction, we simply do not see.

[00:01:23]Kardec also mentions the possibility that certain phenomena attributed to invisibility may be the result of sensory limitations or specific observational conditions. This point is relevant. Human experience is limited by the senses. What we perceive is only a small band of the spectrum of physical reality. Even so, asserting the existence of invisible presences requires objective evidence, something that contemporary science has yet to demonstrate. Perhaps the greatest lesson from this passage is this. Recognizing the limits of perception does not mean abandoning the rigor of investigation.

[00:01:56]Between denying everything and accepting everything, there is the path of responsible study. The invisible may exist at many levels of nature, but each hypothesis needs to be examined critically. Spiritual maturity goes hand in hand with scientific lucidity. If this reflection on invisibility has broadened your view on perception and reality, share this content with those seeking to understand the limits of human experience and continue deepening this journey of conscious study.