A 2-session unit for upper elementary or middle school. Students build a controlled five-step value scale by hand, then spend it like a vocabulary — mapping highlight, light, midtone, shadow, and core shadow onto a sphere and a cube until two flat circles and squares lift into believable solid form.
Build the scale, then spend it. Each value step has a job on the form — and the darkest dark sits just inside the edge as the core shadow.
Level
Beginner
Grade band
Elem–MS
Sessions
2 × 45 min
Total time
90 minutes
Overlay
Square grid
Learning objectives
By the end of the unit, students will:
Define value as the lightness or darkness of a tone, independent of color
Build an even five-step value scale by controlling pencil pressure and layering
Name the value zones on a lit form: highlight, light, midtone, shadow, core shadow, and cast shadow
Shade a sphere and a cube so each reads as a solid three-dimensional object
Evaluate a shaded drawing by checking whether its value steps are distinct and correctly placed
Standards alignment
VA:Cr2.1.5aExperiment and develop skills in multiple art-making techniques and approaches through practice.
VA:Cr1.2.5aIdentify and demonstrate diverse methods of artistic investigation to choose an approach for beginning a work of art.
VA:Re8.1.5aInterpret art by analyzing characteristics of form and structure, contextual information, subject matter, visual elements, and use of media.
Materials
Internet-connected device per pair to view the square-grid overlay and the tool's black-and-white view as a value reference
Graphite pencils — a soft pencil such as 2B or 4B holds an even tone better than a hard HB for shading
Smooth drawing paper, erasers, and an optional blending stump or tissue
A simple white object to light from one side — a foam ball, an egg, a sugar cube, or a paper-wrapped block
One desk lamp or window light per table to cast a single clear shadow
Lesson sequence
1
Building a five-step value scale
45 minutes
Warm-up · 5 min
Show two photos of the same scene — one in color, one converted to grayscale — using the tool's black-and-white view. Ask "Can you still tell what is closer, what is shiny, what is in shadow, with the color gone?" Students discover that value, not color, carries most of the depth information. That is why artists practice value first.
Main activity · 30 min
(3 min) Students draw a row of five equal boxes and label them 1 (white) to 5 (darkest). They open the square-grid overlay so the five boxes have a clean structure to mirror.
(5 min) Box 1 stays paper-white; box 5 is pressed as dark as the pencil will go. These two anchors fix the range — every other step lives between them.
(12 min) Students fill box 3 as a true middle gray, then 2 and 4 as the halfway points. The challenge is evenness: each jump should look the same size. They squint to check — squinting collapses detail and makes uneven steps jump out.
(7 min) Gradient bonus: in a long thin strip, students blend smoothly from white to black with no visible steps, practicing pressure control the scale demanded in jumps.
(3 min) Students hold the scale up to objects around the room and match each object's value to a number, training the eye to read tone as a measurable thing.
Two ways to spend value: discrete steps for clarity, a smooth gradient for soft transitions. Both start from controlling pressure.
Reflection · 10 min
Which step was hardest to get even, and what did you change to fix it?
Why might an artist plan their darkest dark and lightest light before starting a drawing?
What did squinting do, and why does losing detail actually help you judge value?
2
Shading form with the scale
45 minutes
Warm-up · 5 min
Light a white ball from one side and have students point — silently, just point — to the brightest spot, the darkest part of the ball, and the shadow on the table. Naming comes next; first they have to find them with their eyes. Most students are surprised the darkest part of the ball is not at the edge but just inside it.
Main activity · 30 min
(4 min) Teacher names the six zones on the lit ball — highlight, light, midtone, shadow, core shadow, cast shadow — and students label a printed diagram before drawing.
(14 min) Students draw a circle and shade it into a sphere using only their five scale values: highlight left as paper, light and midtone wrapping the form, the core shadow as the darkest band just inside the edge, and a softer reflected light below it. They keep the value scale beside the drawing as a ruler.
(8 min) Students shade a cube next. Unlike the sphere, a cube has flat planes — each face is one value, with sharp edges between them. This contrast teaches that shading follows the form, not a formula.
(4 min) Squint check in pairs: partners confirm each value step is present and that the core shadow reads as the darkest note on the object.
Same five values, two forms. The sphere wraps smoothly; the cube holds one flat tone per face with crisp edges. Shading follows the form.
Reflection · 10 min
Where did you put your core shadow, and why is it not at the very edge of the ball?
How was shading the cube different from shading the sphere?
If you only had three values instead of five, what would you lose?
Reads as a convincing solid with a correct core shadow
Reads as solid with minor issues
Some sense of volume
Still reads as flat
Pencil control
Smooth, intentional tones throughout
Mostly controlled tones
Patchy control
Uncontrolled marks
Extensions
The same subject in high key, full range, and low key. Choosing where your values cluster sets the whole mood of an image.
Mood study: Students shade the same simple scene as high key (mostly light) and low key (mostly dark) and write one sentence on how the mood changed.
Cross-disciplinary (science): Discuss how light falls off on a curved surface and why the reflected light under a ball comes from the table bouncing light back up.
Differentiation: Emerging students use a three-step scale; advanced students extend to nine steps and add a second light source.
Color bridge: Preview that every color also has a value, setting up the color-wheel lesson and a future monochrome painting.
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