The Mathematics of Perspective Drawing

Painters use different techniques to create realistic paintings. Vincent Van Gogh’s Flower Beds in Holland is one of the examples of such.  Given the right distance, you would mistake it for a faded photograph.

But how do painters put so much life in their works? How do they put real space (3 dimensions) on a flat surface (2 dimension)?

One of the techniques used by painters is called perspective.   Perspective is the art of drawing objects in such a way so as to give them depth and show their distance from the observer. This gives a drawing the illusion  of three-dimensional space. » Read more

Dancing and Mathematics? Really?

Sometimes, mathematics appears in places that we sometimes least expect it to be — like in dancing.

dancing and mathematics

Although the figure above is bit of a stretch, Erik Stern (educator, choreographer) and Karl Shaffer (choreographer and mathematician) from     John F. Kennedy Center for the Performing Arts in Washington literally integrated mathematics and dancing in what they called Math Dance. In Math Dance, a class looks like a dance lesson, but it is also a new way  of teaching mathematics.  Math Dance involves translating patterns into choreography and translating patterns to mathematics.  Some of the mathematics learned in math dance are polyhedral geometry, symmetry, the mathematics of rhythm, and variations on dissection puzzles such as tangrams.

The full article with video about Math Dance can be read here.

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Image Source: Unknown (please inform me about its origin if you know).

Lines, Planes, and Perspective

Aside from points, as we have discussed in the previous post, the other two undefined terms in Geometry are lines and planes. A line may be drawn through two points, while three points are needed to determine a plane. The representations of these undefined terms are the building blocks of Euclidean Geometry.  They can be combined to create shapes, drawings, and sketches such as the painting shown in the first figure. Looking at the painting makes us realize that almost all the things around us are  mostly basic geometric shapes.

Bruce Cohen

In the painting above, we can easily see geometric shapes such as rectangles, triangles, trapezoids , and parallelograms. We can also see curves and arcs in vases, flowers, and fruits.  Notice that although the painting seems to be only made by these shapes, the artist has made it look very realistic. For example, the window frames located at the left side of the painting are of the same size, but the artist made the ‘nearer’ frame larger to give a somewhat three dimensional effect.  In doing so, the painter considered the distance of the window frames from the observer.  The farther the frame, the smaller its size. Observe that this technique is more apparent in the painting by Vincent Van Gogh in the second figure. » Read more

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