In this paper, I first want to vindicate Wollheim’s idea that seeing-in, taken as the twofold phenomenologically sui generis experience which picture perception consists in, accounts for the phenomenon of perceptual constancy. Following Wollheim’s usage himself, by “perceptual constancy” I will mean a particular phenomenon of perceptual robustness, namely the fact that a picture’s subject is experienced as undistorted from any point of view in which a spectator may regard a picture. Moreover, I will properly take into consideration the specific impression of “being followed” by the gaze of a picture’s subject in portraits (and alike pictures), which in these cases is a consequence of perceptual constancy. For this impression corroborates a particular reading of what the seeing-in experience really consists in. According to such a reading, in the configurational fold of that experience one experiences both the merely visible surface properties and the design properties of the picture’s vehicle, where such design properties also include the so-called grouping properties of the vehicle. On the basis of such a fold, moreover, in the recognitional fold of the seeing-in experience one knowingly illusorily sees the picture as its subject.