Final answer:
Louis XIV furniture was ornate and symbolized the monarchy's power, while Louis XV furniture adopted a lighter, Rococo style due to a cultural shift towards the aristocracy's comfort and artistic preferences in Paris.
Step-by-step explanation:
The difference between furniture from the reigns of Louis XIV and Louis XV is principally in their styles and the associated cultural movements. Louis XIV furniture is known for its ornate and heavy design, featuring richly woven fabrics, gilded plaster molding, and heavy marbling - all reflective of the Baroque era's grandeur and formality, and it was utilized to demonstrate the absolute power of the Sun King. In contrast, Louis XV furniture is more delicate, featuring lighter, pastel colors, curvaceous lines, and Rococo styling with a predisposition toward lighthearted frivolity and comfort.
This shift in style from the classical and majestic to the more romantic and ornate was due to a change in artistic preferences as the focus moved from glorifying the monarchy (at the centralized location of Versailles) to accommodating the more intimate and social settings of the aristocracy in Paris.