Final answer:
The use of the lyre motif, cornucopia legs, and pedestal bases is most closely associated with Duncan Phyfe, a prominent American cabinetmaker known for his Neoclassicism style and attention to symmetry and balance.
Step-by-step explanation:
The use of the lyre motif, cornucopia legs, and pedestal bases is best known from the work of Duncan Phyfe. Phyfe was a renowned cabinetmaker in America who brought the Neoclassicism style into the design of furniture.
His work is characterized by exceptional design quality with a focus on symmetry and balance, as seen in the designs of the Tambour dressing table and furniture in the Green Room at the White House.
While the Tambour dressing table highlighted the Neoclassicism style, it is the overall balance and delicate carving that sets Phyfe's style apart, rather than a specific motif like lyre or cornucopia legs, which are not mentioned in association with Phyfe's work.