I agree with you. If a person were to stand on a perfectly level place on a globe, like the sea, they would always be on the highest spot, according to their perception. As they observed their view of the globe the edge of their view would appear straight. Their line of sight would make the horizon appear like a perfectly straight line. The only way to view the curvature of the earth is to not be on the earth.
I don't know if I'm making much sense, I can see it my mind, hopefully it translated clearly.
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