Notes, summaries, assignments, exams, and problems for Visual arts

Donatello's David: A Renaissance Icon

Despite being a biblical character, Donatello's *David* is interpreted from a perspective consistent with the humanist view of the new times. David represents the triumph of logic and reason over the brute force symbolized by Goliath. This theme was highly favored in the Renaissance.

This is a freestanding sculpture, made in the round using bronze, and therefore created with the lost-wax casting technique. It represents a pensive teenager in a curious composition. He has Goliath's head at his feet and blatantly rests on his right leg, while curving his body to the left, smoothly forming an 'S' curve, in accordance with the classical model of Praxiteles.

The composition is in *contrapposto*. The body sways... Continue reading "Donatello's Masterpieces: David and Gattamelata Sculptures" »

Tangencies

Making Tangents

Two Circles

• External Tangents: Draw another circle concentric to the larger one with radius R - r. Join the centers. This is the bisector. Draw an auxiliary circle to the centers. Join the center with the points of intersection with the smaller circumference and extend. Where the lines intersect the larger circle will be the tangent points. Parallels are drawn to the smaller circle to find all points of contact.
• Internal Tangents: The process is the same, except that the circle is of radius R + r, and the parallels are drawn to the opposite side.

Tangent to a Circle Passing Through Point P

• If the tangent is to be external, a concentric circle of radius R + r is drawn. From P, an arc of radius R is drawn, which intersects

Orthogonal projections and principal views

Usually called the principal views of an object, these are the orthogonal projections of the object onto six planes arranged as faces of a cube. They can also be described as the orthogonal projections of an object according to the different directions from which you view it. The rules that govern the representation of the views of an object are included in UNE 1-032-82, "Technical drawings: General principles of representation," which is equivalent to ISO 128-82.

Name of views

How the six views are obtained

If we place an observer according to the six directions indicated by the arrows, we obtain six possible views of an object.

Name and common terms for each view

These views have the following denominations:... Continue reading "Orthogonal Projections and Principal Views in Technical Drawing" »

Visible Spectrum

Visible spectrum is the region of the electromagnetic spectrum that the human eye can perceive. Electromagnetic radiation in this range of wavelengths is called visible light, or simply light. There are no precise boundaries in the visible spectrum. A typical human eye responds to wavelengths from 400 to 700 nm, although some people may perceive wavelengths from 380 to 780 nm. The colors of the visible spectrum and their infinite possibilities of mixing can be represented mathematically.

CIE Chromaticity Triangle

The CIE chromaticity diagram (often shown as a triangle) arranges all colors using three chromaticity coordinates x, y, z, which satisfy x + y + z = 1. This means any color or mixture of colors can be defined from two... Continue reading "Visible Light Spectrum, Color Models and Color Temperature" »

Elements of Visual Composition

Visual elements are fundamental components that help us represent shapes, compose designs, and create a sense of volume.

The Point in Art and Design

Characteristics of the Point

The point is often considered the simplest visual element, typically formed where two lines intersect. While often imagined as small and round, a point can have an irregular shape depending on the material used. Points can be employed to create a sense of chiaroscuro and depth.

Expressive Value of the Point

Its color and texture can also be altered within a composition to enhance expressiveness. In a composition, a point placed centrally conveys a sense of balance. Moving it away from the center, however, creates a feeling of movement and instability.... Continue reading "Understanding Fundamental Visual Elements in Design" »

Color Classification and Theory

Colors are generally classified as: Warm (yellow and red) and Cold (blue and green).

Chromatic Scales

Chromatic scales are distinguished in turn as High, Medium, and Low:

• High Scale: Used when modulating the saturation value and containing a high amount of white.
• Medium Scale (Saturated): Used when modulations are not far from the pure, saturated color tone.
• Low Scale: Used when modulating the value and containing a high amount of black (low light).

Polychrome: These are ranges of variations involving two or more colors. The best example of this type of scale is the Rainbow.

Chiaroscuro: Light and Shadow Contrast

The chiaroscuro effect is achieved through the distribution and contrast of light and shadow in a painting... Continue reading "Visual Arts Fundamentals: Color, Light, and Composition Techniques" »

Audio Visual Q1: Color Theory

Color Description

• Chroma: How pure a hue is in relation to gray.
• Saturation: The degree of purity of a hue.
• Intensity: The lightness or dullness of a hue (adding black or white).
• Value: A measure of the amount of light reflected from a hue.
• Shade: Produced by the addition of black.
• Tint: Produced by the addition of white.

Color Systems

• Subtractive Color: Used when mixing colors with paint. Begins with white and ends with black (CMYK).
• Additive Color: Used on computers. Begins with black and ends with white (RGB).

The Color Wheel

• Primary Colors: The basic essence; these colors cannot be created by mixing others.
• Secondary Colors: Colors achieved by mixing two primary colors.
• Tertiary Colors: Achieved by mixing primary and secondary

The Point

A circle and a line are tangent if they intersect at exactly one point. Two circles are tangent if the line joining their centers is tangent to both. An oval is a closed curve formed by arcs of circles and symmetrical about two perpendicular axes. A ball is a closed curve composed of arcs symmetric about one axis.

Graphical Representation of the Point

Graphically, the point is the minimal footprint of a graphical tool. Geometrically, it is the intersection of two lines. The point can take several forms depending on the instrument used to create it: oval, star, round, polygonal, etc.

Sensory Perception of the Point

• Single Point: Located in the center of a bracket or blade, it creates a sense of order or balance. Located at one end, it creates

The Dihedral System and Orthogonal Projection

The Dihedral System is a method for representing an object by its orthogonal projections onto perpendicular planes.

Elements of the Dihedral System

• Projection Planes: These are perpendicular, typically consisting of a vertical plane and a horizontal plane.
• Ground Line (Land Line): The intersection between the vertical and horizontal planes.

Representation of Solids and Standard Views

The system facilitates the representation of solids using standard views (projections):

• Elevation (Front View)
• Ground (Plan View)
• Right Profile
• Left Profile
• Rear Elevation

Axonometric Projection Systems

Axonometric projection projects bodies from three-dimensional space onto a plane, often called the picture plane, providing a volumetric... Continue reading "Fundamentals of Technical Drawing and Projection Systems" »

Defining Cartographic Generalization

Cartographic generalization is the simplification of reality. It involves selecting geographic variables to represent on a map, ensuring the representation is both effective and useful.

Understanding Geographic Variables

A geographic variable is anything located at a site. This can be material (e.g., a house) or intangible (e.g., a political idea), as well as steady (e.g., a road) or dynamic (e.g., a cold front).

Mapping Approaches

There are five primary mapping approaches that are not necessarily incompatible:

• Geometric: Focuses on metric accuracy and measurement. It prioritizes precision over design.
• Technological: Views the map as a tool for storing spatial information, focusing on data collection, processing,