not-the-leaning-tower-of-Pisa

To Lean or Not to Lean..

The Oregon Daily Journal, Portland, Oregon, July 31, 1910

The Lincoln County News, North Carolina, August 2, 1910

Star Tribune, Minneapolis, Minnesota, August 14, 1910

El Paso Herald, Texas, September 30, 1922

Valley Morning Star, Harlingen, Texas, July 13, 1948

The Rhinelander Daily News, March 24, March 24, 1952

The Bakersfield Californian, California, December 13, 1952

The Corpus Christi Caller-Times, Texas, March 14, 1955

The Daily Herald, Provo, Utah, August 9, 1955

The Salem News, Ohio, January 20, 1956

The Waco News-Tribune, Texas, March 13, 1959

Beatrice Daily Sun, Nebraska, November 15, 1964

Abilene Reporter-News, Texas, November 15, 1964

Biddeford-Saco Journal, Maine, February 23, 1973

The Leaning Towers Illusion

These images of the Leaning tower of Pisa are identical, but the one on the right seems to lean more. This is because the brain treats them as a single scene. Usually when you look up to two adjacent towers they appear to converge near the top due to perspective. However, in this case the two towers have parallel outlines. As a result, your brain assumes the towers are diverging. This illusion demonstrates how your visual system tends to treat two side-by-side images as if part of the same scene.