Describe the subtle differences between "can" and "could" when expressing possibility and ability, providing examples to illustrate their usage.
"Can" expresses objective possibility based on current skills or circumstances, while "could" expresses subjective or hypothetical possibility.
"Can" is a stronger modal verb than "could" and always indicates a higher certainty of possibility.
Baroque art features strong contrasts, while Rococo art prefers more subtle transitions
Baroque art is generally larger in scale than Rococo art

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