Gupta Architecture — Key Changes

Entry	Year	Description	Impact
Phase I: Flat-Roofed Temples	c. 400-450 CE	This phase represents the earliest structural temples, characterized by a simple, square `garbhagriha` and a flat roof. They were modest in scale and ornamentation, often with a simple porch. This 'amendment' to earlier forms established the basic structural unit for housing a deity.	Established the fundamental concept of a freestanding, enclosed space for deity worship, moving away from open shrines or rock-cut structures. Example: Temple No. 17 at Sanchi.
Phase II: Temples with a Low, Square Shikhara	c. 450-500 CE	This phase introduced the crucial innovation of a rudimentary `shikhara` (spire) over the `garbhagriha`. Initially, these were low, almost flat, and square, marking the first attempts at a superstructure that visually distinguished the sanctum. This 'amendment' added verticality and symbolic importance to the core shrine.	Pioneered the concept of a superstructure, laying the groundwork for the towering spires of later Nagara temples. Examples: Vishnu Temple at Tigawa, Parvati Temple at Nachna Kuthara.
Phase III: Temples with a Curvilinear Shikhara and Panchayatana Layout	c. 500-550 CE	The final and most advanced phase saw the development of a distinct curvilinear `shikhara` and sometimes a `panchayatana` (five-shrine) layout. The `shikhara` became more pronounced, though still relatively squat compared to later periods. This 'amendment' solidified the classical form of the North Indian temple.	Represented the zenith of Gupta temple architecture, providing the direct prototype for the mature Nagara style. Example: Dashavatara Temple at Deogarh.