Behind the ecclastical ritual, what we see is a crusading conjuncture:
the Albigensan crusade, the Spanish crusade, and the crusade of the pueri, all contemporaneous.
Humans do not see a direct representation of external reality, but a translation formed by their eyes and mind.
Yet seeing in the way described above turns out to be a masterful illusion - a trick played on us by our brains. Our conscious visual experience - also referred to as visual perception - is no more than a model constructed by our brains from surprisingly crude information. Instead of encoding the world in high resolution 3D detail as it appears to us subjectively, the visual brain estimates textures, shadows, surfaces and objects from partial information, infers spatial relations from hardwired rules, creates colour from mathematical (ratio) computations and edits out blinks, eye movements and viewing position from the stream of visual consciousness.
We tend to believe what we see with our eyes is real and accurate. What we often do not realize is that our eyes register only a reflection of the outside world. To reconstruct reality from this reflection we have to rely on associations, inferences and assumptions.Your image of the outside world thus is a mixture of incoming visual information and internal neural factors.