Paradox externally appears as a slightly luminescent "soap bubble" with a diameter of 50 kilometers, with iridescence similar to that of a real soap bubble. Based upon the transmission of radiation sent through the structure of Paradox, it appears to be complex in the interior. It is thought that it might be a four-dimensional extrusion in space and time of a body of much higher dimension. The purpose of Paradox isn't known, but it has been speculated that the purpose is to blank the memory of other large, intelligent Builder artifacts.