 We can think of this argument as an inference to the best explanation. There is a fact that requires explanation, namely, that the three objects resemble each other. The explanation is that they all possess a single property, namely, redness. Thus, platonists argue, if there is no other explanation of this fact (i.e., the fact of resemblance) that is as good as their explanation (i.e., the one that appeals to properties), then we are justified in believing in properties.