Carnap tries to show that by using the method of “quasi-analysis” all the structure can be retained from the basis if the “erlebs” are ordered by a simple relation of part-similarity. Very roughly, the idea is that, although the individual temporal slices of our totality of experience are not structured (and thus have no parts), we can, via quasi-analysis, get to their quasi-parts, the “qualities” they share with other time-slices with which they are part-similar. Of course, time slices of the totality of our experiences can be part-similar with each other in a variety of ways. Perhaps two slices are similar with respect to what is in our visual field at the time in question, or they are similar with respect to what we hear or smell. However, since the time-slices are primitives in the system, we cannot yet even talk about these respects or ways in which the slices should be similar in order to, for example, be considered experiences of the same color. Carnap’s ingenious idea is to group exactly those erlebs together that are mutually part-similar, thereby grouping exactly those that share (pre-theoretically speaking) a property. For simple cases the quasi-analysis seems to give exactly the right results. Consider the following group of erlebs that, pre-theoretically have different colors.