Foreshortening produces errors in the perception of angles pictured as on the ground
Attention Perception & Psychophysics (2016) - Comment
pubmed: 26537919  doi: 10.3758/s13414-015-1012-4  issn: 1943-3921  issn: 1943-393x 

Marta Wnuczko, Karan Singh, John M. Kennedy