DOI Page / Citation link:
https://doi.org/10.11588/diglit.19751#0032
PERSPECTIVE.
The Perspective Plane, called by many the plane of
the picture, is the picture itself. Thus the pane of glass
mentioned above may be considered the plane of the
picture;—also the paper on which you make a sketch of
any object; but it must always be considered as if
placed upright between the student and the object, and
not flat on a table.
The Base Line is the line formed by the bottom of the
picture, or perspective plane.
The Horizontal Line is a line drawn directly across the
picture, parallel with the base line, and always the same
height as the spectator’s eye, which, when raised, causes
the horizontal line to be raised; and when lowered,
causes it to be lowered. The best example which can
be given of this line in nature, is when a person standing
on the shore, looks at the ocean ; the farthest part of the
sea which is visible, and which comes immediately
against the sky, is the horizontal line.
The Point of Sight, called also by some the centre of
the picture, is the eye of the spectator.
The Centre of the picture is a point in the horizontal
line immediately opposite the spectator’s eye; it is not,
however, always placed in the centre, as the term indi-
cates, but sometimes nearer to one end, in what is called
parallel perspective; though, in oblique perspective, it is
generally placed in or very near the centre of the hori-
zontal line. It is in this point that all the lines which
proceed in a direct line from the spectator, or, in other
words, all the lines which are perpendicular to the plane
of the picture, vanish.
The Perspective Plane, called by many the plane of
the picture, is the picture itself. Thus the pane of glass
mentioned above may be considered the plane of the
picture;—also the paper on which you make a sketch of
any object; but it must always be considered as if
placed upright between the student and the object, and
not flat on a table.
The Base Line is the line formed by the bottom of the
picture, or perspective plane.
The Horizontal Line is a line drawn directly across the
picture, parallel with the base line, and always the same
height as the spectator’s eye, which, when raised, causes
the horizontal line to be raised; and when lowered,
causes it to be lowered. The best example which can
be given of this line in nature, is when a person standing
on the shore, looks at the ocean ; the farthest part of the
sea which is visible, and which comes immediately
against the sky, is the horizontal line.
The Point of Sight, called also by some the centre of
the picture, is the eye of the spectator.
The Centre of the picture is a point in the horizontal
line immediately opposite the spectator’s eye; it is not,
however, always placed in the centre, as the term indi-
cates, but sometimes nearer to one end, in what is called
parallel perspective; though, in oblique perspective, it is
generally placed in or very near the centre of the hori-
zontal line. It is in this point that all the lines which
proceed in a direct line from the spectator, or, in other
words, all the lines which are perpendicular to the plane
of the picture, vanish.