A square that could be used magickally; binding, amplifying, bringing to surface, repressing, etc. Tarot cards could be used, or sigils, or objects/fetishes, etc.
Could also be a good shadow work spread (tarot/ogham/runes/etc)
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Backwards Visual Masking
https://www.sciencedirect.com/topics/medicine-and-dentistry/backward-masking
VIII NONSIMULTANEOUS MASKING
Simultaneous masking describes situations where the masker is present for the whole time that the signal occurs. Masking can also occur when a brief signal is presented just before or after the masker; this is called nonsimultaneous masking . Two basic types of nonsimultaneous masking can be distinguished: (1) backward masking , in which the signal precedes the masker (also known as prestimulatory masking ); and (2) forward masking , in which the signal follows the masker (also known as poststimulatory masking ).
Summary
Although many studies of backward masking have been published, the phenomenon is poorly understood. The amount of backward masking obtained depends strongly on how much practice the subjects have received, and practiced subjects often show little or no backward masking (Miyazaki & Sasaki, 1984; Oxenham & Moore, 1994, 1995). The larger masking effects found for unpracticed subjects may reflect some sort of “confusion” of the signal with the masker. In contrast, forward masking can be substantial even in highly practiced subjects. The main properties of forward masking are as follows:
Forward masking is greater the nearer in time to the masker that the signal occurs. This is illustrated in the left panel of Figure 12. When the delay D of the signal after the end of the masker is plotted on a logarithmic scale, the data fall roughly on a straight line. In other words, the amount of forward masking, in dB, is a linear function of log( D ).
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Figure 12. The left panel shows the amount of forward masking of a brief 2 kHz signal, plotted as a function of the time delay of the signal after the end of the noise masker. Each curve shows results for a different noise spectrum level (10–50 dB). The results for each spectrum level fall on a straight line when the signal delay is plotted on a logarithmic scale, as here. The right panel shows the same thresholds plotted as a function of masker spectrum level. Each curve shows results for a different signal delay time (17.5, 27.5, or 37.5 ms). Note that the slopes of these growth of masking functions decrease with increasing signal delay.
(Adapted from Moore and Glasberg, 1983a.)
The rate of recovery from forward masking is greater for higher masker levels. Thus, regardless of the initial amount of forward masking, the masking decays to 0 after 100–200 ms.
Increments in masker level do not produce equal increments in amount of forward masking. For example, if the masker level is increased by 10 dB, the masked threshold may increase by only 3 dB. This contrasts with simultaneous masking, where, at least for wideband maskers, the threshold usually corresponds to a constant signal-to-masker ratio. This effect can be quantified by plotting the signal threshold as a function of masker level. The resulting function is called a growth of masking function. Several such functions are shown in the right panel of Figure 12. In simultaneous masking such functions would have slopes close to 1. In forward masking the slopes are less than 1, and the slopes decrease as the value of D increases.
The amount of forward masking increases with increasing masker duration for durations up to at least 20 ms. The results for greater masker durations vary somewhat across studies. Some studies show an effect of masker duration for durations up to 200 ms (Kidd & Feth, 1982), while others show little effect for durations beyond 50 ms (Fastl, 1976b).
The mechanisms underlying forward masking are not clear. It could be explained in terms of a reduction in sensitivity of recently stimulated neurons or in terms of a persistence in the pattern of neural activity evoked by the masker. Both points of view can be found in the literature. In addition, the response of the basilar membrane to the masker takes a certain time to decay, and for small intervals between the signal and the masker this may result in forward masking (Duifhuis, 1973); see Chapter 6 for further discussion of these issues.
"This technique is backward visual masking, where one image is shown very briefly, and it’s followed
immediately after by another image at the same location, presented for longer. When this is done right, people can’t report the first of the two images, and often deny that it was there at all.
One of the first studies to use backward masking to investigate unconscious perception, employed a method called ‘masked priming’. People were shown a single word followed immediately by a mask that was a meaningless pattern. After each such presentation, they were shown a string of letters and
they had to decide whether it was a real word or not.
Interestingly, people were faster to detect real words when they were semantically related to the word that had been masked, than when it was not. For example, if the masked word was ‘infant’, people would then be faster to recognize the word ‘child’ than they would to recognize the word ‘orange’. This indicated that the masked word had activated a semantic network in the brain. And that the masked word had been processed deeply enough to enable faster recognition of related words.
And this priming effect, was just as large without awareness as with it. In recent brain imaging work, researchers have shown that masked words activate visual areas of the brain more than meaningless strings of letters do, even when people remain unaware of the masked words.
However, unmasked words activate many more regions of the brain, and these areas communicate with each other much more when the words are unmasked."
The McGurk Effect
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tl;dr: Evolution favours agents that do not see reality as it truly is. Seeing reality “as it is” is more likely to lead to extinction.
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