Figure 2.

Perceived Size (y axis) as a function of perceived eye height (x axis) for close objects (a) and far objects (b). We computed the visual angle for each object (as per Eq. 1) and then simulated the perceived size for a range of (mis-)perceived eye-heights (x axis) (as per Eq. 3), while keeping the perceived distance to the target constant at the accurate value. Vertical dashed line indicates true eye height (1.65m), horizontal dashed line and blue arrow indicate actual object size (38.1 m) as used in our experiments. Such a perceived size change would only occur if observers were to base their size judgements exclusively on Eq. (3). You can view the R script used to generate these values on OSF: https://osf.io/mkxad.