Borbin the 🐱

The 300° stereographic down projection is also known as the little planet projection. Usually it is used to transform a 360°x180° into those famous little planets, but in this example it is applied on a vertical 180° panorama with the last photo upside down:

Loaded into PTGui with the little planet transform:

Gets you this amazing view:

See also Panotools projection, The Balcony Panorama and Panotools projections example.