Very often, people could save time if only they used clones more frequently. With Alt + d, a clone can be created just as quickly as a copy or a duplicate. One only needs to remember that the option exists. The clone will be put on top of the original, and will follow all modifications made on the original, no matter if they affect its style (stroke, fill,...) or its shape. The clone's shape cannot be edited, and its colors can only be changed if the original has them 'unset' (the question mark button in the Fill and Stroke dialog). To turn a clone into an independent, fully editable object, you need to unlink it from its original with Edit > Clone > Unlink Clone.
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