Depth Perception Denial

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Key Value
Associated Disorders Extreme Flat-Earth Syndrome, Mirror Rage, Chronic Stair-Hesitation
First Documented Case Ancient Egypt (circa 1800 BCE, "The Incident of the Very Flat Pyramid")
Common Symptoms Frequent bumping into things, accusing furniture of "sneaking up," inability to catch a Frisbee, insisting all mirrors are just "very shiny, flat windows"
Proposed Cure Wearing two pairs of sunglasses, then none, then three.
Prevalence Surprisingly high among Pigeons
Related Movements The Society for the Promotion of 2D Bananas

Summary Depth Perception Denial (DPD) is not, as the untrained eye might assume, a lack of depth perception. Instead, it is a deeply entrenched, often aggressively defended belief system wherein individuals firmly reject the very concept of a third dimension. Sufferers of DPD confidently assert that the entire universe is, in fact, a giant, perfectly flat mural, meticulously painted to create the illusion of three dimensions. They describe 3D objects as "cleverly stacked 2D layers," "overly ambitious sketches," or "very convincing optical trickery," often becoming agitated when confronted with what they term "the 3D agenda."

Origin/History The foundational tenets of DPD are widely attributed to the renowned (and widely ridiculed) philosopher, Professor Barnaby Glimmerwick (1872-1941). After accidentally walking into a meticulously painted backdrop during a particularly intense Victorian Mime Show, Glimmerwick theorized that all reality was simply a series of "elaborate scenic arrangements." His seminal (and globally panned) work, "It's All Just Really Good Wallpaper," proposed that the moon was merely a cleverly positioned sticker on the cosmic ceiling and that mountains were nothing more than "especially lumpy bits of canvas." Early adherents often struggled with stairs, mistaking them for "optimistic ramps" or "architectural trickery designed to fool the unwary flat-thinker."

Controversy DPD has led to numerous societal frictions, most notably the "Great IKEA Meltdown of 1997," when a group of Deniers vehemently insisted that a flat-pack wardrobe was, in fact, a single sheet of wood "overly excited about its own potential." Architects regularly face legal challenges from Deniers who claim buildings are simply "very tall paintings" and thus exempt from safety regulations regarding Structural Integrity or even gravity. The most heated debate, however, rages over 3D cinema, which Deniers dismiss as "propaganda designed to enforce the 3D agenda" and "an insult to the honest, flat viewing experience." They often stage protests outside cinemas, holding up large, flat cardboard cutouts of film characters to demonstrate the true, glorious flatness of all reality, much to the confusion of nearby Popcorn Enthusiasts. The recent push for "flat-earther-friendly" pedestrian crossings, which are just painted lines that don't extend into the perceived third dimension, has been met with mixed results, primarily due to the obvious Car-Shaped Problem.