The north frieze closes with the god of the sea, Poseidon, who rises up out of the ocean with seahorses.
Lastly, the Telephus frieze (Fig.20) narrates in chronological order the life of Telephus, one of the heroes of Greek mythology. Since there was only a limited amount of space available in the upper inner courtyard, the Telephus reliefs were created on shallower slabs that those used for the Gigantomachy around the base. Even though the Telephus frieze was sculpted on a smaller scale, its quality was in no way inferior. In fact, it contained a number of technical innovation in the way that images were organized on the relief panel, which exerted a strong influence on later Hellenistic-Roman art. For example, the figures were created in depth, background landscapes were more detailed and scenic, and architectural elements were used to show indoor activities. Unfortunately, only about 47 panels survived out of the original 74 panels.
The Altar of Zeus includes many friezes and other Greek works of art is recognized as having served as models. For example, Apollo with his idealized stance from the east frieze recalls a classical statue called The Belvedere Apollo (Fig.21) by the sculptor Leochares. Also, Zeus and Athena moving in opposite directions from the east frieze (Fig.7) recall the scene showing the struggle between Athena and Poseidon on the western pediment of the Parthenon (Fig.22). Moreover, the frieze on its part influenced later works of classical antiquity. Laocoön, which was created about twenty years after the Pergamon frieze, is the most famous example. The expression of pain of Laocoön and his sons is very similar to the contorted expression of Alkyoneus (Fig.7). Also, sculpted bodies and movement of Lacoon and his sons recall the bodies of goddesses from Pergamon altar.
I chose this artwork because Pergamon altar is very different from other Greek architectures. The altar stands on a high platform with central steps leading to the top and because of this, you can see the figures of the friezes face to face; you do not need to look up to see the friezes like other Greek architectures. Also, it was interesting to see how the figures are filled with emotion and full of pain. Moreover, the entire composition is depicted in a chiastic shape. This diagonal line shows you drama and movements of the figures. However, I could not find any information about why and how the artist built the altar on a high platform.
In conclusion, the Pergamon altar is the most well known example of Greek architecture because of beautiful building and friezes. The building itself is very unique. It does not only have foundations of Ionic order of Greek architecture, but also stands on a high platform and has a huge staircase. In addition, the altar has friezes that divide into four parts. Every frieze depicts the battle between gods and giants. They are all very detailed and increase the naturalism of the figures by the composition, the texture, and facial expression. All these elements explain why the Pergamon altar is the greatest Hellenistic architecture.

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[ 1 ]. Boundless (Pergamon - Boundless Open Textbook).
[ 2 ]. ENCYCLOPEDIA OF ART and CLASSICAL ANTIQUITIES (visual-arts-cork, 2014).
[ 3 ]. (The Altar of Zeus and Athena at Pergamon, c175 BCE).
[ 4 ]. Michael Lahanas, Hellenicaworld (The Pergamon Zeus Altar).
[ 5 ]. The Pergamon Altar (Smarthistory, Art History at Khan Academy).