Assertion: kaleidoscope's mirror | /r/HasProperty | positioned at angle
Facets:
value: to each other
type: TRANSITIVE-OBJECT
Source sentences:
text: At the most basic level, a kaleidoscope is made of two or more mirrors or reflective surfaces positioned at an angle to each other, usually forming a V-shape or a triangle.
text: In 1646 Athanasius Kircher described an experiment with a construction of two mirrors, which could be opened and closed like a book and positioned in various angles, showing regular polygon figures consisting of reflected aliquot sectors of 360°.