What is the main concept behind the arrow illusion discussed in the video?
Make 3D Printed Optical Illusions

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Computers
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9th - 10th Grade
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The arrow disappears when placed in front of a mirror.
The arrow changes shape when viewed from different angles.
The arrow appears to point in the same direction even when rotated.
The arrow changes color when rotated.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
According to Professor Sugihara's paper, what is the starting point for creating a 3D printable illusion?
A 3D model of a cube.
A two-dimensional shape in the xy plane.
A photograph of the desired object.
A digital rendering of a 3D object.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of offsetting the curve in the Z direction when creating a 3D printable shape?
To change the color of the shape.
To add texture to the shape.
To define the top and bottom edges of the shape.
To make the shape larger.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does an STL file represent in the context of 3D printing?
The material composition of the object.
The surface of a three-dimensional object using triangles.
The color scheme of the object.
The weight of the object.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might it be difficult to define triangles by hand for complex shapes in 3D printing?
Because triangles are not used in 3D printing.
Because complex shapes require many triangles to connect all points.
Because triangles are too small to be seen.
Because triangles are not strong enough for 3D printing.
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