In 1919, Marcel Duchamp, sent, as a gift to his sister Suzanne instructions to place a geometry textbook on her balcony. Suzanne affixed the book to her Paris balcony using wire. The only remnants of the project are a painting she composed in 1920. Duchamp later said of the project "The wind had to go through the book, choose its own problems, turn and tear out the pages… It amused me to bring the idea of happy and unhappy into readymades, and then the rain, the wind, the pages flying, it was an amusing idea."

The Mount Diablo Unhappy Readymade is a project that took place on Mount Diablo in California from 2012-2015. A ring of metal wire was inserted through the pages of the book "New Solid Geometry" (1938) and it was hung by a hemp string to a branch of a Blue Oak tree. The book was documented over the course of its stay (40 months).

The project has several concerns. What are the effects of time, wind, rain, and sun on a book? Why Unhappiness? Are the effects of time and degradation, necessarily unhappy? If a book is a form of coherent memories, what does it "look" like to lose them, to lose a sequence, to move from rational assemblage to irrational entropy? What is the experience of a ritual based on the visitation of an object, an object who is consistently transitioning to new forms?

Early uses of solid geometry.

Early uses of solid geometry.

Early uses of solid geometry.

Early uses of solid geometry.

Figures of solid geometry.

Figures of solid geometry.

Figures of solid geometry.

Figures of solid geometry.

The axioms and postulates of plane geometry.

The axioms and postulates of plane geometry.

The axioms and postulates of plane geometry.

The axioms and postulates of plane geometry.

Exact definition of a plane.

Exact definition of a plane.

Exact definition of a plane.

Exact definition of a plane.

The Use of the Word "Determine".

The Use of the Word "Determine".

The Use of the Word "Determine".

The Use of the Word "Determine".

How a plane is determined.

How a plane is determined.

How a plane is determined.

How a plane is determined.

Postulate 20. (1) A straight line and an outside point determine a plane. (2) Three non-collinear points determine a plane. (3) Two intersecting lines determine a plane.

Postulate 20. (1) A straight line and an outside point determine a plane. (2) Three non-collinear points determine a plane. (3) Two intersecting lines determine a plane.

Postulate 20. (1) A straight line and an outside point determine a plane. (2) Three non-collinear points determine a plane. (3) Two intersecting lines determine a plane.

Points that lie on the same straight line are said to be collinear. Points that lie on the same plane are said to be coplanar.

Points that lie on the same straight line are said to be collinear. Points that lie on the same plane are said to be coplanar.

Points that lie on the same straight line are said to be collinear. Points that lie on the same plane are said to be coplanar.

Intersection.

Intersection.

Intersection.

Intersection.

Postulate 21. If two planes intersect, they have at least two points in common.

Postulate 21. If two planes intersect, they have at least two points in common.

Postulate 21. If two planes intersect, they have at least two points in common.

Postulate 21. If two planes intersect, they have at least two points in common.

The Intersection of two lines.

The Intersection of two lines.

The Intersection of two lines.

The Intersection of two lines.

A line perpendicular to a plane.

A line perpendicular to a plane.

A line perpendicular to a plane.

A line perpendicular to a plane.

If a line is perpendicular to each of two intersecting lines at their point of intersection, it is perpendicular to the plane according to the lines.

If a line is perpendicular to each of two intersecting lines at their point of intersection, it is perpendicular to the plane according to the lines.

If a line is perpendicular to each of two intersecting lines at their point of intersection, it is perpendicular to the plane according to the lines.

Corollary 1. A plane can be drawn perpendicular to a given line at a given point on the line.

Corollary 1. A plane can be drawn perpendicular to a given line at a given point on the line.

Corollary 1. A plane can be drawn perpendicular to a given line at a given point on the line.

Corollary 1. A plane can be drawn perpendicular to a given line at a given point on the line.

Corollary 2. Only one plane can be drawn perpendicular to a given line at a given point of the line.

Corollary 2. Only one plane can be drawn perpendicular to a given line at a given point of the line.

Corollary 2. Only one plane can be drawn perpendicular to a given line at a given point of the line.

Corollary 2. Only one plane can be drawn perpendicular to a given line at a given point of the line.

Corollary 3. A plane can be drawn perpendicular to a given line on a given point not in the line.

Corollary 3. A plane can be drawn perpendicular to a given line on a given point not in the line.

Corollary 3. A plane can be drawn perpendicular to a given line on a given point not in the line.

Corollary 3. A plane can be drawn perpendicular to a given line on a given point not in the line.

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