Impossible object maker online
Use the free impossible object maker online: draw a 2D shape, change its joins and inspect the result in your browser. No login is needed.
By ShapeKeeper · Last reviewed
The impossible object maker online is the drawing canvas on ImpossibleShape.com. Use it to create a 2D impossible-object drawing, edit the connections and run a geometry check. The free browser tool needs no login. This guide explains the making process; the homepage canvas and detector is where you draw and test.
An impossible object is a picture that suggests a solid structure whose intended connections cannot all hold in ordinary 3D space. You can make a convincing 2D drawing without producing a buildable object. The aim is to make the contradiction readable, rather than simply making a shape look unusual.
How to make an impossible object
- Choose a reference. A cube, rectangular frame or classic illusion gives you a clear starting structure.
- Sketch the visible edges with connected line segments. Keep the background simple and leave the junctions easy to inspect.
- Choose one visual rule to break: a beam connection, a front-behind relationship or a change from solid material to empty space.
- Change that part while keeping the nearby widths and directions consistent. A convincing corner makes the eventual conflict easier to notice.
- Run the detector and read its reasons. Make one further edit, then compare what changed.
If you need a reference before drawing, compare the impossible object examples. For a small first project, the easy impossible shapes guide helps you choose between a blivet, triangle and cube.
Creator, designer and detector: what each step means
Use the canvas as an impossible object creator when you place and edit your lines. Use it as a designer when you compare alternative joins or adjust the spacing. Run the detector when you want a heuristic reading of the visible geometry. Those steps share a workspace, but the detector does not guarantee that every drawing has a single correct 3D interpretation.
The online impossible-shape drawing guide covers clean endpoints and crossings. For a boxier design, try an impossible rectangle drawing and inspect whether each corner keeps the same apparent beam width.
Compare a possible version with the illusion
Save or keep a copy before changing a joint. In one version, let the beam ends remain disconnected or use a consistent overlap. In the other, close the frame so its intended connections conflict. Ask what a viewer must assume about each corner for the object to look solid.
A surprising view can also come from a real object. Richard Gregory's account of impossible pictures and objects includes a physical arrangement that resembles the Penrose triangle from a particular viewpoint. That distinction matters when interpreting a drawing: an impossible-looking image is not proof that no arrangement could produce that view.
What happens to your drawing?
The drawing and image analysis run in your browser. Uploads and custom strokes are not sent to an image-processing server. If you share a custom drawing link, its coordinates are included in the link, so anyone receiving it can inspect the shared drawing.
Check the methodology and result limits before treating a verdict as mathematical evidence. You can return to the learning hub for explanations of ambiguity, line extraction and the differences between classic impossible objects.
Maintained by ShapeKeeper, the anonymous ImpossibleShape site administrator. Send corrections to [email protected]. This handle does not imply academic or professional credentials.