by Bob Bahr
When drawing any form of even the mildest complexity, it helps to sketch in the parts you can't see. Once your hand and mind are trained, these lines won't be as necessary, although even the most accomplished artists lightly draw construction lines for helpful reference. These lines are easily erased or covered over later.
The simple cube or rectangle is a perfect example. Unless you are drawing from a vantage point directly facing one of its sides, any building will show how drawing construction lines can help. The box's angles disappear out of sight, promising some sort of polygon if seen from above, but unless the angle of the line is drawn correctly, your Empire State Building will suggest a trapezoid instead of a rectangle. Draw the hidden, back corner of the building, connect the lines to square up the form's angles, and the drawing will be convincing. We learn this as kids, but somehow we forsake it as adult artists.
Examination of drawings by accomplished artists will not turn up these lines, but whether they were ever sketched is a separate question—they may have been erased. Most skilled artists don't need to draw the hidden corner of a cube, but many will, just as reference. Leonardo faintly drew the hidden lines of machines and structures in his sketchbook so he could work their structures out in his mind and with his hand. That should be more than enough license for the rest of us.
|Twisting Gesture (detail)
by Dan Gheno, 2004, sanguine crayon, 24 x 10.
Note how Gheno drew the shape of the rib cage even though it is not visible from the surface. This allowed him to properly orient the rest of the torso.
|Preparatory study for Suit Shopping: An Engraved Narrative, Triptych, Scene 4
by Andrew Raftery, graphite.
Raftery drew the figures for his final prints naked before working on the finished version of his drawings in which they are clothed.
|Fey, Seated (detail)
by Sharon Allicotti, 2005, colored pencil
on blue-green paper,
25 x 19.
Note how the footstool hid the lower part of the model's right leg, but Allicotti drew it in anyway to ensure that the visible part of the right foot was properly sized and oriented in relation to the rest of the body.
| Most drawing teachers will tell you that understanding what's beneath the skin of a human figure will help you accurately draw what is visible from the outside. Sketching the basic shape of the rib cage, as Dan Gheno did in Twisting Gesture, reminded him of the torso's orientation and structure. Clothes obscure even the skin, so it's not surprising that artists throughout history have started their compositions by first drawing the figures naked, then redrawing them clothed in the appropriate costume. Jacques-Louis David used this method, as did Thomas Eakins. Andrew Raftery, a contemporary printmaker and art instructor, takes this further by making nude models of figures in wax, sketching the resulting diorama, and then working up to a finished drawing.
Many artists' sketchbooks include drawings of skulls, skeletons, and muscle groups, and all are exercising this approach: Draw what you don't see but know is there.
There is value in drawing exactly what you see instead of what you know is there. Drawing through observation instead of relying on preconceived notions is a crucial step in an artist's early development. But extending a line you know is there through a form that sits in front of it is not a fatal compromise of this principle. The best way to accurately render the line of the road, even as it passes behind that picturesque barn or copse of woods, is to draw it.
Similarly, if a limb or even the torso of a figure is obscuring another limb (or a part of the torso), draw through the figure or limb and complete the line. You can erase it later.
by Sigmund Abeles, 2006, charcoal,
24 x 18.
Collection the artist.
|Sigmund Abeles's sketch of a neighbor and model demonstrates two more examples of drawing what you don't see (view an audio slideshow demonstration of Stephanie). Note how Abeles left more blank paper to the left of the model than to the right. The artist explains that he needed to â??give room for the action to act.â? Stephanie was looking out the window, stage left. Abeles' blank area gives her a place to look.
Secondly, in the early stages of the drawing Abeles sketched in construction lines showing the form of the chair in which the model was sitting—including lines showing the part of the chair hidden behind the body. It allowed him to more accurately draw the curves of the support and to more convincingly depict the figure's weight on it. A believable figure of substance needs something solid to sit on, and incorrectly rendering the curved lines of the chair would rob the drawing of its credibility—and seemingly put the model at risk of a tumble.
|Bust of a Woman Holding an Urn
by Simon Vouet, ca. 1644, black chalk heightened with white on buff paper, 91/2 x 8. Collection Louis-Antoine Prat.
Vouet took no chances in drawing the entire elliptical opening of the urn, even though the liquid pouring out of its opening was obscuring part of the ellipse.
|The internet has many websites with tips, complicated algorithims, and elaborate illustrations dedicated to helping people understand the nature of ellipses and some methods for rendering them. It is senseless for a draftsman to make matters more difficult by not lightly sketching a hidden area of the oval shape.
If you are drawing a glass, draw the entire ellipse that forms the bottom of the glass, even though you may only see the front of it. This pertains to the lip of the opening in a vase too. Draw the complete ellipse, and erase the hidden portions after you are satisfied that the curve is accurate.
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