Blink
A most intriguing episode from Doctor Who series creates the weeping angel, unknown creatures survived as long as universe and evolved to have quantum-lock system in their biology. It means they don’t exist when they are observed. At the moment they’re seen by other living creatures, they are freezed into rock. They can feed time energy only when they are not observed. So to defend life against them should not blink. Its motive of the story is from the brief theory of observer effect and uncertainty principle in quantum mechanics. Borrowing the concept from the theory of physics is very clever and convincing to plant strong image about the unseen.
Then its invisible and variable properties connect with the imaginative quality of water at night, which I find a link to Bachelard’s text in Water and Dreams: His interpretation between their fluidity and the aspect of ambivalent matter can meet the idea of the matter at quantum level as in-between wavelength and substance. In his quote, night takes away the evidence of our existence: it can transform to the action of “blink” in the episode as well as in the psyche. Blinking is a fleeting moment of night to the subject. The moment fetches subconscious fear of drowning in the dark as if dragged by the invisible, which is the property of water at night.
Apart from actual scientific theory, thinking of the visible turning to be invisible is the opposite way of the origin of art. I amused by concepts going forward and backward in the episode. My brainstorming in dream geometry started like this, from the idea of interrelation or intervention among different concept which is integrated into time and space.