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Example: The default leg of a chair (output) may be a long rectangular square. If its maker tapers the ends for no other reason than personal aesthetic preference, that tapering is art. If he tapers it for a functional (mechanical) reason it is part of 'engineering design' and not art. If he makes the leg round as on a lathe it may or may not be an artistic decision.
If for looks - artistic.
If to make it less likely to splinter or cause stubbed toe injuries, etc. it is engineering design.
There are two main aspects of art which cause the most debate.