There are two main reasons to be skeptical of this assessment. First, there is evidence that passive transport in the gondola may have disrupted the development of the kittens’ innate visual paw placing responses (Ganz 1975: 206). Second, the fact that passive kittens were prepared to walk over the edge of a visual cliff does not show that their visual experience of depth was abnormal. Rather, as Jesse Prinz (2006) argues, it may only indicate that they “did not have enough experience walking on edges to anticipate the bodily affordances of the visual world”.