An accidental image feature that appears but not disappears

Sawada, Tadamasa; Volk, Denis

doi:10.1016/j.jmp.2024.102841

Cited by 2 publications

(1 citation statement)

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“…There are multiple potential factors that can produce the Ames room illusion, such as the rectangularity and the symmetry of the shape of the illusory room as well as the parallelism of the linesegments, the horizontalness of the floor, and the textures of the walls and the floor in the illusory room. If one wants to study these factors, the geometrical properties of the Ames room should be well understood and it should be possible to control the room systematically (see Sugihara, 1986Sugihara, , 1997Sugihara, , 2005Sugihara, , 2014aSugihara, , 2014bCowan, 1974Cowan, , 1977aCowan, , 1977bCowan, , 1982Sawada & Dvoeglazova, 2023;Sawada & Volk, 2024 for studies analyzing some other 3D geometrical illusions).…”

Section: Introductionmentioning

confidence: 99%

Understanding the geometrical properties of an Ames room and controlling it systematically and quantitatively

Myrov,

Gorina,

Vodorezova

et al. 2024

Preprint

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Within an Ames room, the perceived size of objects, such as people, changes dynamically when the objects move about within the room. The shape of the Ames room is not actually rectangular but it is perceived to be rectangular. Unfortunately, the geometrical properties of the Ames room have often been misunderstood, and rooms that have different shapes are also referred to as “Ames rooms” in many articles. In this study, the geometrical properties of the original Ames rooms constructed by Adelbert Ames, Jr. were analyzed. We found that these original Ames rooms are 3D-to-3D perspective transformations of rectangular illusory rooms. Based on this analysis, we also developed a computational model that can construct a generalized Ames room that has a hexahedral shape with some free parameters that quantitatively control (i) the size and aspect-ratio of a rectangular illusory room, (ii) the amount of distortion of the Ames room from a rectangular room, and (iii) the viewpoint of an observer. This model was implemented as a computational program so that an Ames room can be constructed in a VR space. It also allows us to design an Ames room that depends on the size of the available real space and to physically construct the Ames room in this real space.

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