horizontal-line

If from _A_ we draw a diagonal of that square and produce it to the line _KK_ (which may represent the horizontal-line in the picture), where it intersects that line at _A·_ marks the distance that the spectator is from the point of sight _S_.

The Theory and Practice of Perspective 1876

After practising for some little time in this way we shall get accustomed to what are called perspective deformations, and soon be able to dispense with the glass and the tracing altogether and to sketch straight from nature, taking little note of perspective beyond fixing the point of sight and the horizontal-line; in fact, doing what every artist does when he goes out sketching.

The Theory and Practice of Perspective 1876

In landscape and cattle pictures a low horizon often gives space and air, as in this sketch from a picture by Paul Potter -- where the horizontal-line is placed at one quarter the height of the canvas.

The Theory and Practice of Perspective 1876

They are not to be confused with the horizon or horizontal-line.

The Theory and Practice of Perspective 1876

The horizontal-line _HD_ and the base or ground-line _AB_ are represented as receding from us, and in that case are called vanishing lines, a not quite satisfactory term.

The Theory and Practice of Perspective 1876

And we can't help but think the pictured new billboard doubles as an anti-depression ad -- doesn't it seem like the little Zoloft pellet guy is about to float in and turn everyone's horizontal-line mouth into a double-wide 'U'?

Entertainment Weekly's PopWatch 2009

And we can't help but think the pictured new billboard doubles as an anti-depression ad -- doesn't it seem like the little Zoloft pellet guy is about to float in and turn everyone's horizontal-line mouth into a double-wide 'U'?

Entertainment Weekly's PopWatch 2009

And we can't help but think the pictured new billboard doubles as an anti-depression ad -- doesn't it seem like the little Zoloft pellet guy is about to float in and turn everyone's horizontal-line mouth into a double-wide 'U'?

Entertainment Weekly's PopWatch 2009

And we can't help but think the pictured new billboard doubles as an anti-depression ad -- doesn't it seem like the little Zoloft pellet guy is about to float in and turn everyone's horizontal-line mouth into a double-wide 'U'?

Entertainment Weekly's PopWatch 2009

And we can't help but think the pictured new billboard doubles as an anti-depression ad -- doesn't it seem like the little Zoloft pellet guy is about to float in and turn everyone's horizontal-line mouth into a double-wide 'U'?

Entertainment Weekly's PopWatch 2009