User Portlet User Portlet

Erik Mahieu
Discussions
![enter image description here][1] The above photo of an arrangement on my desk looks inspired by René Magritte's surrealistic painting "[Ceci n'est pas une pipe][2]": none of the 4 images are a real "[Utah Teapot][3]". Two of them are anamorphic...
Glad you like this, Frederick. I know there is also refraction through the (relatively thin) glass wall of the drinking glass. The error is more significant toward the edges where there is a very sharp angle of incidence. This is why I avoided the...
Self-anamorphism is when an image is equal to its reflection. As demonstrated in [my previous community contribution][1], this is is only possible in a conical mirror. In a cylindrical mirror one can have "double images" when both the image and its...
![enter image description here][1] Looking at the YouTube illusion "[Ambiguous Garage Roof][2]" by the Kokichi Sugihara demonstrates once more that what we see does not always represent reality. His beautiful illusion is based on perspective...
I discovered a book. "**Interactive Computational Geometry**, A Taxonomic Approach" by Jim Arlow on [this WRI site][1]. Maybe in Chapter 5 there are some details about intersections of geometric objects? **Chapter 5** - **intersections**: The...
![enter image description here][1] All the above objects will reflect in a spherical mirror as the same virtual club suit image. They are part of an infinite number of anamorphic objects that will reflect to the same image. In this contribution,I...
![enter image description here][1] Recognize your favorite snack or beverage in the above pictures? No worry, it is a catoptric- or mirror anamorphosis. These are distorted images that can only be seen undeformed when reflected in a mirror from a...
Was a negligent “copy/paste”! Thanks for your correction Oliver!
I was too curious to wait for 12.2 and upgraded to macOS Big Sur (11.0.1). I did not have any problem whatsoever with Mathematica 12.1.1. I use a iMac27inch 3.6 GHz Intel core I9. I also do not have the problem mentioned by George Woodrow and do...
![enter image description here][1] It looks hard to decipher the text in the above image : that's because it is a cylindrical anamorphic image. This means you need a cylindrical mirror and a specific viewpoint to interpret the image correctly. I...