PERSISTENCE OF VISION

Persistence of vision is the commonly used term to describe the optical illusion whereby multiple discrete images blend into a single image in the human mind and believed to be the explanation for motion perception in cinema and animated films. (WIKIPEDIA)

Persistence of vision is still the accepted term for this phenomenon in the realm of cinema history and theory. 

A frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images. Audiences still interpret motion at rates as low as ten frames per second or slower (as in a flipbook), 

Modern  film runs at 24 frames a second.

We are going to work on Flipbooks in order to get motion out of still images.

Let´s try one using this site.

Once we have done a digital one, we´ll start working on paper.

GOOGLE DOODLES: LOTTE REINIGER

Lotte Reininger

Lotte Reininger created visually stunning and fantastical films using black cardboard, scissors, and boundless imagination. Pre-dating Walt Disney by nearly a decade, Reiniger pioneered a style of animation that relied on thousands of photos of paper cut-out silhouettes arranged to tell a story. It was a painstaking process that involved moving paper characters ever so slightly and snapping a photo of each movement. She created many films over the years, including The Adventures of Prince Achmed, the oldest surviving feature length animation.

Nearly a century later, Reiniger continues to inspire animators and artists. On what would have been her 117th birthday, we celebrate Reiniger’s limitless creativity and pioneering spirit. 

Nowadays silhouettes are still used by many artists such as this hungarian shadow theatre group called Attraction. They create pictures with shadows of their bodies.

TECHNICAL DRAWING VS ARTISTIC DRAWING

Radial Symmetry, GeoGebra and Google Drive

Click on the image beside and try to make a similar one yourself. Remember that you can change colour, width and the number of axis as well.

If you wish, it´s better to download the GeoGebra applet and work offline.

This applet works with dynamic random colours. In the video below you can find out how to use it.

POLYGONS

Polygons 100830211438-phpapp01 from rfarinas

OPERATIONS WITH SEGMENTS AND ANGLES

A PLANE can be defined by:

Please, follow the steps below. And here you have the notes. Exercise 1. Line bisector of a segment

Thales´Theorem (measuring the Pyramid)

If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points the other two sides are divided in the same ratio.

According to some historical sources the Greek mathematician Thales applied the intercept theorem to determine the height of the Cheops' pyramid. 

Thales measured the length of the pyramid's base and the height of his pole (a long stick). Then at the same time of the day he measured the length of the pyramid's shadow and the length of the pole's shadow.

Exercise 2. Dividing a segment into a set number of equal parts 

Exercise 3. Angle bisector 

4.Dividing an angle into 3 equal parts

Segment copying construction Copying an angle

LETTERING

Lettering helps to communicate information on drawings. All lettering should be done freehand without the aid of instruments. It must be neat, clear and easy to read. There are many different approaches to lettering, but the one shown below is standard for school use.

The letters and numbers are formed between light construction lines called guidelines, which are drawn 4 or 5 mm apart. Capital letters are usually used, but lower-case letters may be used. Note the following:

• The letters A C D E G H K M O Q R W fill a square space.
• The letters O and Q are based on a circle.
• The remainder (except I) fill about two-thirds of a square.
• Space between words should be equal to the with of one letter, and the distance between letters and numbers must be uniform. Keep the letters in each word close together.