Oscar Reutersvärd (29 November 1915 – 2 February 2002) was a Swedish graphic artist, who in 1934 pioneered the art of 3D drawings that may initially appear feasible, yet cannot be physically constructed.

Born on 29 November 1915 in Stockholm, Sweden, he reportedly suffered from dyslexia and had difficulty estimating the distance and size of objects.

However, as the eye tries to follow its outlines, the triangle abruptly becomes a dizzying experience as its bottom link plays havoc with the brain's intuitive knowledge of physical laws."

In 1958, he read the now classic article by Lionel and Roger Penrose on impossible objects,[2] which included the triangle and staircase that the British father and son team had developed independently.

"[3] The shaky lines, often exacerbated by working on the ten hour train ride between Stockholm and Lund, is obvious in some of his pictures.

[5] In addition to his development of impossible figures, he was a designer of many public works in Sweden, including large sculptures, mazes and architectural features.