“…Yes, we can use the GIS data to identify "what is next to what", or in this case, how "close in proximity" things are to each other; however, we are missing a critical component -what did these "things" look like? Viewshed analyses measure objects (represented as pixels) as visible or non-visible and while we can employ, for example, Higuchi viewsheds (Higuichi, 1983;Richards-Rissetto, 2010;Wheatley and Gillings, 2000), to account for diminishing vision over distance, other factors affecting visual acuity such as background clarity and color are absent (Bernardini et al, 2013;Wheatley and Gillings, 2000). Yes, we can use a database to code the presence/absence or types of, for example, iconography or hieroglyphs, but the concept of indexicality extends to the third dimension.…”