I’ve been obsessed with small mechanical tricks for as long as I can remember — the kind of thing that fits in your hand and transforms a simple sketch into a tiny world. This pocket-sized parallax viewer is one of my favourite make-at-home projects: compact, cheap, and surprisingly magical. It turns a single drawing (or a set of drawings) into a layered diorama that shifts with your eye, hinting at depth and movement without electricity or complex mechanics.

What is a parallax viewer and why I love it

A parallax viewer is essentially a small viewing device that uses layered artwork and a narrow viewing slit or window to create the illusion of depth and relative motion. As you move the viewer (or your head), foreground and background elements appear to shift at different speeds — that’s parallax in action. I love this format because it’s intimate: the viewer becomes a participant, peering into a miniature scene that reveals itself slowly. It’s also wonderfully forgiving; you don’t need exact perspective or perfect painting skills to get a pleasing effect.

Materials you’ll need

Here’s a list of what I usually gather before I start. Most items are inexpensive and widely available.

  • Cardboard or heavy cardstock (300–350gsm) for the main body
  • Thin card or foamboard for internal layers
  • Tracing paper or vellum (for atmospheric mid-layers)
  • A sheet of clear acrylic (0.5–1mm) or transparency film for the viewing window
  • Craft knife (I like an X-Acto No. 1)
  • Self-healing cutting mat
  • Metal ruler and pencil
  • Double-sided tape, PVA glue or a glue stick
  • Masking tape or washi tape (handy for temporary holds)
  • Fine-tipped pens, gouache or watercolour, coloured pencils or markers
  • Optional: small strips of foam tape or cardstock spacers to create consistent gaps between layers

    • If you want a more polished finish, pick up a folding bone folder and a corner-rounding punch. I also sometimes use spray mount for photographic prints.

    How it works (a quick explanation)

    The trick is simple: you build a shallow box with a narrow slit or window for viewing. Inside, you place multiple layers of artwork at slightly different distances from the eye. When you look through the slit and move the viewer side-to-side, nearer layers shift relative to farther ones. Even very small offsets — a few millimetres — are enough to create convincing depth.

    Designing your scene

    I like to start with a rough thumbnail. Think in three planes: foreground, middle ground and background. You can work with simple silhouettes for strong contrast (very effective) or add details and shading for a richer look.

  • Foreground: bold shapes that read clearly at a small scale (tree trunks, a figure, a window frame)
  • Middle ground: the “story” elements (a bicycle, animals, a small house)
  • Background: sky, distant hills, or simple gradients

    • Note: the parallax effect is strongest when shapes overlap and when foreground elements have strong dark values. If you’re working digitally, I often separate layers and print them onto heavyweight paper. If you prefer analogue, use opaque inks or gouache for flat, vibrant layers and tracing paper for hazy atmospheric effects.

    Cutting template and box dimensions

    For a pocket-sized viewer that comfortably fits in your hand, I use these approximate dimensions as a starting point (feel free to scale up or down):

    Body (external)100mm wide × 70mm tall × 25–30mm deep
    Viewing slit40–50mm wide × 6–8mm high (centered horizontally)
    Layer panels90mm × 60mm (slightly smaller than the internal box space)

    The internal depth (25–30mm) is split between your layers. If you use three layers, a spacing of 5–12mm between them is a good range. Thicker spacing makes more obvious parallax, but remember the whole piece should still be flat-ish and pocketable.

    Step-by-step build

    I’ll outline the general process I follow. Adapt materials and measurements to suit your style.

  • Make the outer box: cut a rectangle of heavy cardstock (external size above). Score and fold into a shallow sleeve or box with a top flap. You want a neat opening on one side where you’ll fit the viewing window.
  • Create an inner frame: cut a rectangular opening that lines up with your viewing slit. This inner frame keeps layers aligned and reduces stray light. Glue it inside the box, about 5mm from the front edge.
  • Prepare layer panels: cut 3–5 panels from thin card to the internal size (e.g., 90 × 60mm). These are where you’ll draw or glue your artwork. I like to leave a small margin around each panel so they sit cleanly in the frame.
  • Decorate each layer: work from background to foreground. For background, simple gradients or washes work beautifully. For middle and foreground, you can cut away negative space to reveal layers beneath (a very effective technique). If you want atmosphere, add one translucent tracing-paper layer between middle and background.
  • Mount the layers: use tiny strips of double-sided tape or small foam spacers on the panel edges to set the distance between layers. Don’t glue everything in place permanently at first — test the movement and parallax effect with temporary tape until you’re happy with the depth.
  • Fit the back: once the layers sit correctly, insert them into the box and close the rear panel. Seal with glue or tape. If you want a removable back to change scenes, skip the permanent glue and use a snug friction-fit tab instead.
  • Install a lens or peephole (optional): for a more cinematic look, you can glue a small clear plastic disc (from an old transparency or cheap magnifier) just inside the viewing slit. It slightly narrows the field of view and sharpens the layers.

    • Troubleshooting common issues

    If the effect looks flat:

  • Increase spacing between layers or add an extra layer. Even a 2–3mm change makes a difference.
  • Make the foreground darker and more contrasted; strong silhouettes sell depth.

    • If you see distracting light leaks or reflections:

  • Line the interior with matte black paper or dilute black paint to reduce glare.
  • Use a deeper inner frame to limit the viewing cone.

    • If layers rub or don’t slide smoothly:

  • Replace adhesive with tiny foam pads to stop friction, or file down rough edges on the panels.

    • Variations and playful experiments

    Once I had the basic viewer working, I started playing with variations. Here are a few ideas:

  • Animated flip element: add a thin card tab that, when pulled, shifts one layer horizontally creating a simple “animation” while you view.
  • Lightbox version: place a tiny LED behind the back layer (diffused with tracing paper) to get a glowing background effect.
  • Pop-up elements: combine small folded tabs so certain parts (a character’s head, a lamppost) stand forward slightly and wobble as you move the viewer.
  • Hybrid prints: print photographic textures for backgrounds and hand-paint foreground silhouettes for a rich mixed-media feel.

    • How I use this in my practice

    I often build these viewers as quick test rigs for characters or set designs. They’re perfect for trying out layering ideas before committing to a larger piece. I also love making multiples as tiny gifts — a single scene can become a whole set of small dioramas to slip into an envelope and post. In workshops, participants love the immediacy: you can go from blank card to functioning viewer in about an hour.

    Final tips

  • Keep your sketches loose — parallax loves suggestion, not hyper-detail.
  • Test colors under the viewing slit early; colours can read darker than you expect in the small, confined space.
  • Document your successful layer combinations so you can reproduce them later.

    • This little device is one of my favourite ways to celebrate the slow surprise of looking closely. It’s modest, tactile, and endlessly adaptable — exactly the kind of small wonder I like to keep in my pocket. If you make one, please tell me what scene you built; I’m always excited to see how other people interpret depth and story in miniature.