Palladian and Neo-Palladian interiors universally rely on
several structural components that vary very little and provide
the foundations upon which the decoration and furnishings can be
applied. These include: These are not always based on Palladio’s
work, nor on classical examples. Sometimes they have been
adapted from other architectural styles and had Palladian
features and ornamentation added to them. Architectural
treatises, such as Pain’s British Palladio, first published in
1786, often discussed and demonstrated the rules of Palladian
construction. They were extremely important in the development
of Neo-Palladian building. This plate shows plans and elevations
for two varieties of Palladian staircase, one rectangular and
one spiral.