They key concept in drawing in perspective is the vanishing point: every line in your slide should disappear in it (see an earlier blog post). It turns out I got the concept slightly wrong all the time. Because of the curve in the Earth’s surface, the real vanishing point for someone standing at sea level is actually below the horizon. A vanishing point that sits on the horizon, would require the radius of the Earth to be 64x as large. (For comparison, the Sun as a radius about 109x that of Earth.

Vanishing point at a planet with a radius 64x that of Earth

Vanishing point at a planet with a radius 64x that of Earth

The accurate vanishing point

The accurate vanishing point

With this new knowledge, will I change my approach to slide design? Not sure.

Based on an article in NRC Handelsblad. Simulation images by Siebren van der Werf.

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