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Line–line intersection. In Euclidean geometry, the intersection of a line and a line can be the empty set, a point, or another line. Distinguishing these cases and finding the intersection have uses, for example, in computer graphics, motion planning, and collision detection . In three-dimensional Euclidean geometry, if two lines are not in ...
Intersection (geometry) The red dot represents the point at which the two lines intersect. In geometry, an intersection is a point, line, or curve common to two or more objects (such as lines, curves, planes, and surfaces). The simplest case in Euclidean geometry is the line–line intersection between two distinct lines, which either is one ...
Two sets of arrows that exhibit the Müller-Lyer optical illusion. The set on the bottom represents the classic Müller-Lyer stimulus, while on the top is its Brentano modification. All the shafts of the arrows are of the same physical length. The Müller-Lyer illusion is an optical illusion consisting of three stylized arrows. When viewers are ...
Bar (heraldry) In heraldry, a bar is an ordinary consisting of a horizontal band across the shield. If only one bar appears across the middle of the shield, it is termed a fess; if two or more appear, they can only be called bars. Calling the bar a diminutive of the fess is inaccurate, however, because two bars may each be no smaller than a ...
The lines pile up on top of each other at the band head, and may not be viewed separately. They have become unresolvable. Double head. Two bands may overlap with the head of one on top of another band or close to each other. This may make a stepped appearance. The two band heads close to each other are called a double head. Headless band
Apart from rhyme, and considering only the arrangement of ideas, and the placement of the volta, a number of sonnets maintain the two-part organization of the Italian sonnet. In that case the term "octave" and "sestet" are commonly used to refer to the sonnet's first eight lines followed by the remaining six lines.
The Hering illusion (1861): When two straight and parallel lines are presented in front of radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards. Hollow-Face illusion: The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face.
A line wavy (also called undy) [12] is a sine wave, often used to represent water; a line nebuly is similar but with more exaggerated meanders, representing clouds. There are confusing, ambiguous and non-standard uses of a wavy in the military heraldry of the United States to refer to irregularly wavy lines. [13]