Q: What do the signs signify 'in themselves'?
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Again, the advert's text is key here. 'Speeded up', 'more and more rapid', 'much faster': these phrases in the first paragraph of the advert mean that the sign with the ship and car and so on signifies something like 'accelerated speed'. The second paragraph, though, represents the phone as distinct from that: it is 'instantaneous'.
Q: What kind of signs are these images: iconic, indexical and/or symbolic?
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They are all iconic, because they have a likeness to their referents. They are also symbolic, as they are being used to show an arbitrary relation to other qualities: speed and communication.
Text of answer 2.
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