This page looks at other art work of impossible illusions, beyond the artwork of M.C. Escher. Herein again, we show that many of the illusions look impossible yet could be realized. This work below presents some of these three-dimensional models that were designed and built using geometric modeling and computer graphics tools.

Convention

In the following sequences, figures are frequently presented in pairs. The left figure in each pair is the front view-Escher's drawing's direction, whereas the right figure gives a general view. Whenever a real, tangible model has been created, it will be presented as a second pair to the right of the pair of computer rendered images. The objects were physically realized with the aid of layered manufacturing systems: a Z402 3D Printer from Zcorporation and a Stratasys FDM3000 printing machine. Click on any image below to get the full size version of these images.

The David Star - Two Penrose Triangles

We start with two of the Penrose triangle objects (also independently invented by Oscar Reutersvard) intertwined together only to create the david star shape... An STL geometry file, for those of you with layered manufacturing devices, of this model, is available here .

A small clipping at the edge of the triangle that makes the
echnion's version.

The Impossible Torus

The impossible torus is, in fact, a very possible object. One can easily construct it in any solid modeler by sweeping a square shape along a circle trajectory, while the square is rotated. The four instances of the impossible torus differ from each other only by the amount the square cross section is rotated while swept along the 360 degrees of the circle, starting from 90 degrees rotation on the left, all the way to 360 degree in the right example.

The Hex Nut

The hex nut is another quite known example of impossible shapes. Here again, one can construct a real 3D object that from a certain view will look like the impossible hexnut.

Here is another, continuous way, of making a 3D object that looks like the infamous impossible hexnut for a certain view location.

The Garden Fence (original drawing by Sandro Del-Prete)

The original "impossible" art work of Sandro Del-Prete called the "Garden Fence" is realized here as a 3D model that is similar to the original drawing from one view point.

ZCorp (Can you recognize the logo?) has the ability to build colored models nowadays, so here we take advantage of this feature.

The Folded Chess Set (original drawing by Sandro Del-Prete)

Another original "impossible" art work of Sandro Del-Prete called the "Folded Chess Set" is realized here as a 3D model that is similar to the original drawing from one view point. This is a simple one as it is merely a folded chess board...

Impossible Cylinder (original drawing by Istvan Orosz)

An "impossible" cylinder art work by Istvan Orosz (A poster design) is realized here. This cylinder is, in fact, a double-twist Moebius ring.

Impossible Window (original drawing by Jos de Mey)

A simple variation on an "impossible" art work by Jos de Mey ("Curious Wagtail in a Strange Small Window") is realized here. This is one window out of quite a few renditions out there. Try this animation, to see this window from different angles.

Impossible Windows in an Impossible Cylinder

Combining the above two drawings, we have these impossible windows inside the impossible cylinder. Try this animation, to see this cylinder with windows from different angles.

An impossible stool

This impossible stool is created using a special "impossible models" modeling package that is part of the GuIrit modeling environment.

Menorat David

The fact that in three-space we have three orthogonal views for a model, allows one to design three-dimensional objects that look completely different from different direction and are completely independent. Herein, we mold together the david-star and the Menorah emblem of Israel. © Copyright, Gershon Elber 2003-12.

Here is the real, tangible, piece.

Here is another variant with the Menora on one view and the Technion's logo on the other. © Copyright, Gershon Elber 2004-12.

Here is the real, tangible, (colored!) piece.

Stripes in Three Dimensions (inspired by a planar drawing by Victor Vasarely)

Victor vasarely has a (not so known) drawing of a horse in which parallel lines are shifted in the planar drawing to give the illusion of a three-dimensional object, or depth. Here we exploit a similar idea to construct bars that are twisted independently in X and Y so that two independent pictures could be seen from the Y and X directions. The logo of the Technion (right) and of its CS department (left) are etched into these two directions. © Copyright, Gershon Elber 2003-12.

Here is the real, tangible, piece.
Also, one can order these vertical lines at random. Try this animation, as an example.

Extensions to three views of three different images (inspired also by the zigzap/lenticular printing of Yaacov Agam)

Yaacov Agam introduced the idea of presenting two different images via a zigzag structure (also known as lenticular printing in the micro level). Herein we extend this idea to three different images from three different views. Shown: a general view (top left), a view of Ben Gurion (top right), a view of Herzl (bottom left), and a view of Rabin (bottom right). The animation shows the model as it is continuously rotated. Made using ZCorp technology. (C) Copyright, Gershon Elber 2003-12.