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! Category !! Description
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| [[ObservationObservations/Distance|Distance]] || We can see too far, where's the curve?
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| [[ObservationObservations/Gas Pressure container|Gas Pressure requires a container]] || Gas Pressure requires a container
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| [[Observations/Interferometry|Interferometry]] || Interferometry (Michelson-Morley experiments)
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| [[ObservationObservations/Perspective|Perspective]] || Understanding Perspective
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| [[ObservationObservations/SunRays|Sun Rays]] || Crepuscular / Anti-Crepuscular rays.
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| [[ObservationObservations/Flat|It's Flat]] || The horizon always appears perfectly flat.
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| [[ObservationObservations/Horizon Rises|Horizon always rises]] || The horizon always rises to the eye level of the observer as altitude is gained.
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| [[ObservationObservations/Water|Water maintains Level]] || The natural physics of water is to find and maintain its level, Rivers run down to sea-level finding the easiest course, North, South, East, or West
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| [[ObservationObservations/Surveyors engineers and architects|Surveyors, engineers and architects]] || Surveyors, engineers and architects are never required to factor the supposed curvature
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