Penrose triangle
Being only one color.
Misspelling of centrifugal.
An optical illusion depicting an impossible solid object made of three straight beams of square cross section which meet pairwise at right angles at the vertices of the triangle they form.
African forms of Christianity
美術学生は、三つの直線の梁が互いに直角で接し不可能な立体を作る錯視である不可能な三角形を熱心にスケッチした。
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