The Wave Illusion

Overview

Students are introduced to Op Art and will develop their ideas by planning and making a wave-based optical illusion. They will use drawing skills and colour blending from light to dark to create the illusion of depth on a flat page.

Learning intentions

• WALT understand how Op Art creates optical illusions using pattern, line and contrast.
• WALT use a range of techniques and media (drawing and coloured pencil) to explore visual effects.
• WALT record observations and test ideas in a simple sketchbook planning space.
• WALT develop proficiency by accurately constructing a wave drawing and blending colour to show form.

Success criteria

• I can draw a continuous squiggly wave line across the page with even spacing.
• I can connect dots to create repeated “bumps” that support the wave pattern.
• I can blend coloured pencil from light to dark to make the wave look 3D.
• I can explain my choices using at least two reasons (line, spacing, contrast, or colour).

Curriculum links

• Students will use sketchbooks/journals to record ideas and test techniques as a basis for exploring their work.
• Students will use a range of techniques and media, including drawing and coloured pencil (painting-style colouring through pencils).
• Students will develop creativity and ideas while increasing proficiency in execution.
• Students will develop a critical understanding by making reasoned judgements about their own optical illusion results.

Lesson structure (60 minutes)

1. 0–6 min · Hook (Op Art quick look). Teacher shows printed Op Art examples (teacher-prepared sheets) and asks students what they notice about the lines and colours; students share observations in pairs and name one feature (pattern, contrast, repetition).

2. 6–18 min · Direct teach (wave illusion model). Teacher demonstrates on the board/paper: how to place a row of dots, connect them to form a repeating bump/wave, and then add a squiggly wave line across; students watch, then sketch a thumbnail wave (small size) in their sketchbook.

3. 18–30 min · Construction on paper (dots + wave). Teacher models dot spacing and guides students to plan their wave across the page with a clear margin; students mark dots lightly, connect them carefully, and draw the squiggly wave line that follows the pattern.

4. 30–45 min · Colour technique teach (light to dark blending). Teacher demonstrates coloured pencil blending across a section: starting with light pressure/colour, then gradually increasing to darker tones; students choose two or three pencil colours and practise a small gradient strip beside their sketch before applying it to the wave.

5. 45–55 min · Make (build the 3D effect). Teacher monitors for accuracy and contrast, prompting students to check spacing and add darker values to the “turns” of the wave; students apply light-to-dark blending along the wave so one side/edge appears to advance and the other recedes.

6. 55–60 min · Critique & exit ticket (reasoned judgement). Teacher leads a short “two stars and a reason” share; students complete a quick exit ticket: “My illusion works because…” followed by one sentence explaining their line/contrast/spacing choice.

Resources

• Op Art reference prints (teacher-made handouts, no originals needed)
• A4 drawing paper for final piece (1 per student)
• Sketchbooks or A5 planning space (1 per student)
• Coloured pencils (at least 3–4 light-to-dark shades available; class set)
• HB pencils and rubbers
• Rulers (optional) for consistent margins
• Example step-by-step model sheet (teacher copy)
• Display board/visualiser or board for demonstrating dot connections
• Exit ticket slips or a half-page worksheet

Assessment

• Formative check during construction: teacher circulates to see if dots are evenly spaced and connections form repeated bumps/wave rhythm.
• Formative check during colouring: teacher looks for gradual blending (not just colouring in patches) and meaningful contrast (light to dark).
• Exit ticket: assess whether students can give a reason for effect using at least one correct concept (contrast, spacing/repetition, or line).

Differentiation

• Support: provide a pre-drawn dot grid/wave template strip for students who need scaffolding; add sentence starters for the exit ticket (“My illusion looks 3D because…”).
• Support: demonstrate blending on a small practice box; encourage using light pressure first, then layering.
• Stretch/extension: challenge students to vary the illusion by changing dot spacing slightly (wider/narrower) and compare which produces stronger depth.
• SEN/EAL: allow students to work step-by-step (dots first, then lines, then colour) with clear visual steps; encourage peer support in pairs during the making phase.