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It is a madrasa with an open courtyard, two floors, showing a four-eyvan plan scheme. The turquoise colored tiles of the mosque to the right of the entrance hall and the two side halls have been effective enough to give this madrasa the name Gök Madrasa. Gök Madrasa, one of the most outstanding monumental monuments of Seljuk art, is one of our rare works in which decorative art and architecture are integrated with each other.
"Gök Madrasa, especially with its monumental marble crown door and facade XIII. It literally reflects the character of the century. The main eyvan, which should be in the eastern direction of the madrasa, was destroyed; later, it was built in wood by Mufti Sayyid Abdullah Efendi.
Although a large part of the turquoise colored tiles of the mosque section to the right of the entrance have fallen, they retain their splendor. The perimeter borders of the mihrab of the mosque surround verses written in the floral kufi style with dark blue, purple and turquoise colored tiles. the transition to the hexagonal pulley of the square-planned mosque dome measuring 5.20 x5.20 mic was achieved with the help of Turkish triangles. Brick-tile mosaic was used together in the triangles and the dome. After the hexagonal hoop, three hadiths were written around the hem of the hemispherical dome. Ayatel-kursi is written in kufi script around the mihrab decorated with tiles.
The facade of Gök Madrasa is 31.25 m. The crown door covers approximately 1/3 of the facade. Along with the minarets, the 25 molan high crown door reached 1.80 m from the facade. The madrasa is entered through a door measuring 4 x 7 m. The top of the entrance wall is covered with a star vault. The entrance opens to the masjid of the madrasa on the right and the daru'l-kurra part on the left through two mutual doors on the sides of the eyvan. Minarets can be reached from inside these rooms. The mosque was made bigger than the classroom. This place is completely covered with a dome sitting on a triangular belt.
While the old tradition continues with large rhombuses on the minaret bodies, the large eight-pointed star on the side wings of the facade attracts attention. Due to the marble material on the crown door, which is one of the masterpieces of plastic art, the light-shadow values contribute to the overall appearance. It can be thought that the side towers with plastic decor are decorated with crown door decoration in order to provide balance. A search for a balance between the glazed brick and tile-Decked minarets and the berkitme towers has been made.
There are two windows with marble and muqarnas cavsara on both sides of the crown door, which is glorified by minarets, providing internal openness and light. The crown disrupts the symmetry of the facade in a way with its three-sided fountain to the left of the door, three-sliced arch, two-line inscription and three-way wandering geometric border; however, it gives richness to the facade.
Again, the eight-pointed motif created by the pipe erasures attracts attention. Below this, in the composite plant bundle relief, leaf motifs, pomegranate fruit, bird and eagle motif, which is made to look like a facade at the top, are placed symmetrically on the sides. This motif is called the “Tree of Life” motif.
Under the tree of life motif, an octogon fills the eight-pointed star formed by two intersecting squares. There is writing in it and the gaps are filled with twisted branches. The motifs described above are also symmetrically embroidered under the other minaret. They look more spectacular because this operation is detailed and careful and because the material is marble.
The entrance of the crown door is made of interlaced colored marble with a flattened arch and descends uninterrupted to the base. A leaf relief sits on the upper corner stones as a brand new and unique motif. Intricate animal heads fill the inside of the leaf with each other. It is believed that the signs of the horoscope are meant in this composition, where the heads of Aries, fox, bull, duck, horse, bird, lion, snake and elephant are recognized. Some of these animals are also present in the twelve animal calendar of the Turks. The animals of this calendar are rats, cattle, pars, rabbits, dragons, snakes, horses, sheep, monkeys, chickens, dogs and pigs.
Evliya Çelebi also writes that the madrasa, which has no equal in the Islamic world, has a large door like the castle gate, the classrooms and the rooms belonging to the students keep about eighty.