If Arda was always round, and never flat, How could the Lamps of the Valar on either end (north and south) of Middle-earth light the whole 'continent'? If Arda was round, they would have only lit up the regions physically possible until the curve of the planet stopped the light from shining into the central regions, in particular Almaren.
And the same goes for the Trees of the Valar in the Undying Lands. They would have only lit up the northern region if Arda was round at that time.
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