He takes a 360° panorama and still ordinary photos – on all pictures, the horizon appears as a straight line. Let's examine the following situation: someone stands on a small island in the middle of the ocean and sees the horizon all around. During recording, you rotate around your axis moderately fast and get a 360° panorama as a result. Many modern cameras offer the possibility of panorama shots. This condition is usually not fulfilled, but our sense of sight is quite tolerant here. For photographs, the correct distance for viewing is the focal length of the lens multiplied by the magnification factor. The angles seen on the resulting drawing are only exactly the same as the original ones if you look at them from exactly the same distance as the eye had from the plane with the crossed threads. Note the sharpened stick placed in front of the draughtsman's eye as an aid to always bring the eye to the same position.
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