Possible Clues:

• Wavy molding
• Double curve, in architecture
• Love the expression of surprise on seeing moulding!
• Ess-shaped curve
• Arch molding
• Gothic molding
• Ornate arch
• Moulding with cross-section in the form of a letter S
• Old horse half visible in architectural feature
• Architectural moulding in the shape of a flattened S