One of the best examples of a clear issue with metaphorical thinking came from discussions about the plaque installed on Pioneer 10. Some clever people thought up the idea of using a pulsar map to define where the sun/earth were. Some other clever people noted that pointing to the location with a line that ended in an arrow was very, very deeply rooted in the history of human hunting techniques and could be very hard to understand if you have never seen or even conceived of an arrow(head).