Curated OER
Science Kids: Science Images: Vertical and Horizontal Line Length Illusion
This is a vertical and horizontal line length optical illusion. The vertical line that is part of the image on the left looks longer than the horizontal line but when it is checked with a ruler on the right image it is proved that they...
Curated OER
Science Kids: Science Images: Parallel Lines Cafe Wall Illusion
This famous optical illusion makes the parallel horizontal lines appear to be bent when in fact they are straight. It was originally noticed amongst the tiles of a cafe wall and can now be seen in architecture such as on a large building...
Curated OER
Y = (2/3)X 4
This lesson on slope explains the slope concepts, demonstrates how to use the slope formula, shows how to find slope in horizontal and vertical lines, and how to use slope to find whether the lines through the pairs of points are...
Curated OER
Y = 2x + 3
This lesson on slope explains the slope concepts, demonstrates how to use the slope formula, shows how to find slope in horizontal and vertical lines, and how to use slope to find whether the lines through the pairs of points are...
Curated OER
Eternal Egypt: Head of Senusert the First
The head was carved in the style of the Eleventh Dynasty with small slanting eyes and horizontal eyebrows, a straight mouth surrounded by an incised line, and the alternate dark and light bands of the royal head cloth carved in radiating...
Curated OER
Eternal Egypt: Lintel of Amenhotep the Second
The lintel, a horizontal beam or stone above a door, is dominated by a figure of Horus of Behdet. Two hieroglyphic lines give the names and titles of Amenhotep the Second.
Curated OER
Science Kids: Science Images: Orbison Illusion
This optical illusion, known as the Orbison illusion, gives the effect that the rectangle and inner square are distorted. This effect is caused by the horizontal V shaped lines.
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