Taj Mahal
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Dome
The marble dome that surmounts the tomb is its most spectacular feature. Its height is about the same size as the base of the building, about 35 m. Its height is accentuated because it sits on a cylindrical “drum” about 7 m high.
Because of its shape, the dome is often called an onion dome (also called an amrud or guava dome). The top of the dome is decorated with a lotus design, which serves to accentuate its height. The dome is topped by a gilded finial, which mixes traditional Islamic and Hindu decorative elements.
The dome shape is emphasised by four smaller domed chattris (kiosks) placed at its corners. The chattri domes replicate the onion shape of main dome. Their columned bases open through the roof of the tomb, and provide light to the interior. The chattris also are topped by gilded finials.
Tall decorative spires (guldastas) extend from the edges of the base walls, and provide visual emphasis of the dome height.
The lotus motif is repeated on both the chattris and guldastas.
Finial
The main dome is crowned by a gilded spire or finial.The finial used to be made of gold until the early 1800's, but is now made of bronze. The finial provides a clear example of the integration of traditional Islamic and Hindu decorative elements. The finial is topped by a moon, a typical Islamic motif, whose horns point heavenward. Because of its placement on the main spire, the horns of the moon and the finial point combine to create a trident shape -- reminiscent of the traditional Hindu symbols of Shiva.
Similarly, the spire is made up of a number of bulbous forms. The central form bears a striking resemblance to a Hindu sacred water vessel (kalash or kumbh).

Minarets
At the corners of the plinth stand minarets: four large towers each more than 40 m tall. The minarets again display the Taj Mahal's basic penchant for symmetrical, repeated design.
The towers are designed as working minarets, a traditional element of mosques, a place for a muezzin to call the Islamic faithful to prayer. Each minaret is effectively divided into three equal parts by two working balconies that ring the tower. At the top of the tower is a final balcony surmounted by a chattri that mirrors the design of those on the tomb.
The minaret chattris share the same finishing touches: a lotus design topped by a gilded finial. Each of the minarets was constructed slightly out of plumb to the outside of the plinth, so that in the event of collapse (a typical occurrence with many such tall constructions of the period) the material would tend to fall away from the tomb.
Decoration
Exterior decoration
Nearly every surface of the entire complex has been decorated. The exterior decorations of the Taj Mahal are among the finest to be found in Mughal architecture of any period.
Once again, decoration motifs are repeated throughout the complex. As the surface area changes -- a large pishtaq has more area than a smaller -- the decorations are refined proportionally.
The decorative elements come in basically three categories:
• Calligraphy
• Abstract geometric elements
• Vegetative motifs
Islamic strictures forbade the use of anthropomorphic forms.
The decorative elements were created in three ways:
• Paint or stucco applied to the wall surface
• Stone inlay
• Carvings
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