Note the thumbnail below is a degraded version of the actual image which is much sharper. A Necker cube is basically a wireframe drawing of a six-sided cube such that it has no perspective as to whether you're looking at it from the top or from the bottom. This is an example of two exactly identical necker cubes, the one on the left showing an intermediate object going in "down from the top" while the one on the right shows the object going in "up from the bottom" which shows how the image can change its perspective simply by changing which face (front or back) appears behind the intervening object. 多維資料集 多維資料集內克 光學幻覺 多維資料集內克 2
A set of 3 Geometry shapes floating in mid-air on a metallic platform. Drawn with Inkscape. 幾何 幾何 形狀 幾何 2
An example of a necker cube and an Impossible cube (one arm runs across the other but is still straight, which can't happen in 3D; it's an optical illusion). 多維資料集 多維資料集內克 光學幻覺 不可能的多維資料集和多維資料集內克
The difference of two cubes. Typeface is Tuffy (public domain, created by Thatcher Ulrich) from openfontlibrary.org 多維資料集 差異 相對補 兩個多維資料集的差異
A set of 3 Geometry Shapes floating in mid-air with a metallic floor and a metallic graph in the background. Drawn with Inkscape. 幾何 幾何 形狀 幾何 4
library school music education text book math knowledge mathematics arithmetic learning wikibooks textbook Math Music Textbook clip art 數學 音樂 教科書 圖書館學校音樂教育文本書數學知識數學算術學習維琪教科書教材
symbol square number math mathematics letter-i i-square imaginary Imaginary Math Symbol clip art 虛數 數學 符號 符號廣場編號數學數學字母 I 我方形虛
The magic constant of this square is 34. Besides its four corners sum 34, the four central number sum 34, the four middle numbers of upper and lower rows sum 34 like the four middle numbers of the columns left and right. If we divide the square into four squares have the numbers that make up each added 34. 廣場 魔術 數學 魔術方塊
A parabola on a Cartesian coordinate grid. Typeface is Tuffy (public domain, created by Thatcher Ulrich) from openfontlibrary.org 寓言 數學 數學 寓言