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Metrology
- A height, out of one photograph
- Flattening a façade out of the photograph
- How wrong a measurement from one picture can be
- The one thing a single view cannot give
- The plan hidden in the photograph
Light
- A mirror is a second camera
- A shadow is a second projection
- Where shadows vanish
- The penumbra is the lamp's image
Construction
- Alberti draws a pavement, and chooses where the reader stands
- Brunelleschi drilled a hole in his panel
- One, two and three point are one construction
- The distance point is the viewing distance, drawn
- The horizon is at eye level — if the picture plane is vertical
- The measuring point, and the step the method leaves out
Viewing
- An anamorph at true size, on paper
- Anamorphosis is only a viewpoint
- The cylindrical mirror unbends it
- The point you have to stand at
- When the picture surface is not flat
- Wide angle is not distortion
- Standing in the wrong place
Curved
- Every fisheye is a different rule
- No picture surface keeps everything
- Stereographic keeps every angle, and only stereographic
- The cylinder, and the price of going all the way round
- What a 360-degree photograph actually is
Parallel
- Parallel projection is not primitive perspective
- The eye taken to infinity
- What isometric actually means
- Which axis scales are possible
Foundations
- The circle whose centre moves
- Recovering the camera from the picture it drew
- What a projection destroys
- Where parallel lines meet
- A projection of a projection
Wrong
Lens
- A lens destroys the invariant
- Fitting a lens from straightness alone
- Straight lines that are not
- The eye is a place, not a point
- The principal point is not the centre
Refraction
- A picture through water has no viewpoint
- The port that is not there
- The sky inside a cone
- What a ray does at a surface
- What survives a pane of glass
Twoviews
- The image of the other eye
- A point is a line over there
- Eight points and the basis they are read in
- Four cameras fit, and one of them can see
- Two views give shape and no size
Depth
- Depth is a reciprocal
- The range a pair cannot see past
- Two rays that do not meet
- A turn of the head is not a step sideways
- A wrong match is not a small error