of skepticism, in that sometimes "suspension of judgment evidently just happens to the sceptic". An aporetic skeptic, in contrast, works more actively towards their goal, engaging in the refutation of arguments in favor of various possible beliefs in order to reach aporia, an impasse, or state of perplexity, which leads to suspension of judgement. The zetetic, finally claims to be continually searching for the truth but to have thus far been unable to find it, and thus continues to suspend belief while also searching for reason to cease the suspension of belief. Modes Although Pyrrhonism's objective is ataraxia, it is best known for its epistemological arguments. The core practice is through setting argument against argument. To aid in this, the Pyrrhonist philosophers Aenesidemus and Agrippa developed sets of stock arguments known as "modes" or "tropes." The ten modes of Aenesidemus Aenesidemus is considered the creator of the ten tropes of Aenesidemus (also known as the ten modes of Aenesidemus)—although whether he invented the tropes or just systematized them from prior Pyrrhonist works is unknown. The tropes represent reasons for suspension of judgment. These are as follows: Different animals manifest different modes of perception; Similar differences are seen among individual men; For the same man, information perceived with the senses is self-contradictory Furthermore, it varies from time to time with physical changes In addition, this data differs according to local relations Objects are known only indirectly through the medium of air, moisture, etc. These objects are in a condition of perpetual change in colour, temperature, size and motion All perceptions are relative and interact one upon another Our impressions become less critical through repetition and custom All men are brought up with different beliefs, under different laws and social conditions According to Sextus, superordinate to these ten modes stand three other modes: that based on the subject who judges (modes 1, 2, 3 & 4), that based on the object judged (modes 7 & 10), that based on both subject who judges and object judged (modes 5, 6, 8 & 9), and superordinate to these three modes is the mode of relation. The five modes of Agrippa These "tropes" or "modes" are given by Sextus Empiricus in his Outlines of Pyrrhonism. According to Sextus, they are attributed only "to the more recent skeptics" and it is by Diogenes Laërtius that we attribute them to Agrippa. The five tropes of Agrippa are: