From: The World In Your Head by Steven Lehar

Fig. 6.10 The forms of nature are often far more complex than can be assimilated with a single glance, as demonstrated here by the fact that it takes intensive scrutiny and a serial search to discover the differences between trees (A) and (B). However, the limitation is one of short-term memory when glancing from one tree to the other. Phenomenological observation suggests that the full extent of detail in a figure like this is indeed present in immediate consciousness. This can be verified by treating the two trees as left and right eye images of a stereo pair. Fusing these two images makes the tiny differences between them pop out in parallel, showing that the full detail must be present in immediate consciousness, even if it does not penetrate to short-term memory.