 The fact that the inside mode exclusively results from body senses, with no influence from external senses, has also been questioned by recent empirical evidence (Stein &amp; Meredith 1993; Ernst 2006; van Beers et al. 1999; Welch &amp; Warren 1980). Information from one modality can affect information in another modality. Multisensory effects occur very early on in sensory processing and they are often automatic and mandatory. Consequently, the ‘normal’ way of gaining bodily self-knowledge is not on the basis of body senses only, but rather on the basis of their integration with vision. Take the rubber hand illusion, which results from the incorrect integration of somatosensory information and visual information about the rubber hand. It induces not only a sense of ownership for the rubber hand, but also proprioceptive drift (i.e., one mislocalizes one’s hand in the direction of the location of the rubber hand) and referred sensation of touch (i.e., one feels touch on the rubber hand). It can be explained by three major facts about the sensory systems. First, optimal estimates of bodily properties require combination of information from various sensory channels. Second, vision can dominate over proprioception and touch because it often offers more accurate and precise spatial information. Third, visual information can affect the phenomenal content of bodily experiences. What we feel is determined not only by information from body senses, but also by information from external senses. Our access to the intrinsic properties of our body is also partly based on vision. Although O’Shaughnessy (1989: 56) claims that that our body image is nothing more than a collection of information from body senses, it has been found that blind individuals have a less accurate representation of the size of their body parts compared to sighted individuals (Kinsbourne &amp; Lempert 1980: 37). The fact is that vision is the only sensory modality that can directly and reliably (though not perfectly) process size information (Longo &amp; Haggard 2010). As concluded by the neurologist Schilder (1935: 38) a long time before multisensory research had started to take off: 