Shapes Instead of Lines: Form Through Colour

Opaque paint rewards a different way of thinking than ink does. With acrylic and gouache you can lay light over dark, correct shapes, cover edges. That's precisely why you don't need a line here to enclose a form. In this lesson you put the pencil away completely and build your picture from patches alone.

No Contour: the Boundary Makes the Shape

A shape comes into being where two colour areas meet. The roof is a dark grey-brown, the sky above it a light blue-grey – the roof edge is nothing other than the boundary between these two tones. You don't have to trace it in addition. If you do, you're telling the same piece of information twice, and the sketch quickly tips into the illustrative: coloured-in outlines instead of painted shapes.

The price is attention. You can't draw first and colour in afterwards; you have to place the shape in the right spot the moment you set the brush down. That's why a shape-based sketch always begins with seeing, not with the brush.

Squint Until Only Shapes Remain

Narrow your eyes until the subject goes out of focus. Details disappear, window frames, lettering and leaves dissolve – what remains are large tonal areas. Hold that for a few seconds and count in your head: how many clearly distinguishable shapes do you actually see? Usually surprisingly few. Sky, roof band, facade in light, facade in shadow, the dark zone of the shop windows, the bright pavement. Whatever you can no longer separate while squinting belongs in the same shape in your picture.

One Shape, One Colour, One Value

Mix the tone fully on the palette, not on the paper. Then put it down with the flat brush in three to five strokes and leave it alone. The narrow side of the flat brush draws your edge, the broad side fills – one brush, two functions. Resist the urge to start modelling within a shape. Variation comes later; first the picture needs clear values.

When mixing, remember that gouache dries a little lighter and acrylic often ends up a shade darker and richer. So set your values a touch more decisively than looks right while they're wet.

Big Brushes for as Long as Possible

Stay in the picture with the broad brush until it genuinely no longer works. The big brush forces you to simplify; the small one tempts you to count roof tiles before it's even clear where the roof sits. A good order: large shapes, medium shapes, and only in the final minutes a narrow brush for at most three or four accents – a light edge, a window frame, a figure. These accents only work because everything beneath them is painted broadly.

Negative Shapes: Paint the Sky, Not the Roofs

The most effective trick when working in shapes: don't paint the object, paint the space around it. Instead of copying a roof silhouette, lay in the sky and stop exactly where the roof begins. The houses appear by themselves, as a reserved space, and almost always sit more convincingly than a drawn contour.

With trees it works the same way. Instead of painting branch by branch, you put the gaps of sky between the branches in sky colour and let the branchwork stand as the dark connection. For foliage, dab a few light gaps into the dark crown – and the eye already reads a mass of leaves, without a single leaf.

Controlling Edges: Hard at the Focus, Soft Everywhere Else

Edges are your tool for directing attention. A hard edge occurs when you set wet paint onto a dry area: crisp border, maximum presence. Exactly two or three such edges belong at the centre of the subject, where you want the eye to linger.

You get a soft edge by dragging an almost dry brush with very little paint over the partly dried neighbouring shape. The paint breaks up, edges fray, the shapes merge into one another. With acrylic this is often the only route, because the area dries too quickly; gouache can still be blended wet in the first moments. Use soft edges for backgrounds, shadow zones and everything that should recede.

Why This Is an Old Practice

Quick sketches outdoors were built this way long before the paint tube was invented: small oil studies the size of a cigar box lid, set down in thirty to sixty minutes, without preliminary drawing. It was never about completeness, but about capturing light and value relationships before the sun moved on. Exactly the same logic carries your opaque-paint sketch: value before detail, patch before line.

Exercise

Stand in front of a row of shops, a terrace of houses or a line of market stalls – at a window, the street front opposite works too. Set a timer for 20 minutes. Squint for two minutes and decide in your head which twelve shapes you're going to paint, for example sky, roof band, facade in light, facade in shadow, shop window zone, awning, pavement in light, pavement in shadow, road, one tree, two figure patches. Then paint exactly those twelve shapes with the flat brush and count as you go. Not a single line stroke, no preliminary drawing, the sky around the roofs. Only in the last three minutes may you add a maximum of four accents with a narrow brush. If you already look finished at shape nine, that's a good sign, not a bad one.