 In one version of this contrast, there are two figures differing only in their orientation to the viewer (on a page, the top and bottom of the square is parallel with the top and bottom of the page; while the diamond is just like the square except rotated 45 degrees around its center.) Assuming that the property of being a square is the same as the property of being a regular diamond (an assumption defended by Peacocke in 1993, contested by Tye 2003, but granted by Tye 2004), this appears to be a case in which there is a phenomenal difference without any difference in the properties represented. The options, then, are similar to the ones listed in the discussion of the inverted color qualia: (i) deny that there is a difference in content corresponding to the phenomenal difference; (ii) hold that there are differences in the way the property of being square is represented, i.e., invoke different modes of presentation of this property (Peacocke 2001a, 2001b); (iii) find some other property that is represented in one experience but not the other, such as the viewer-relative property of resting on a side, or the property having two horizontal sides (properties allegedly attributed by experience to the square but not the diamond); and the property of standing on a point or the property of having inclined sides (properties allegedly attributed by the experience to the diamond but not to the square) (Tye 2005). Here we have another case of a debate between Fregean and Russellian positions on the nature of experience content.