My points were in response to the author .He is the one who introduced the suggestion that the horse was facing West .The only way to show that was in error is to point out how it wasn't and that meant using the same type of terminology .
If you look over the posts I'm pretty sure you used more compass direction terminology than I did .
Similarly you suggested that the sunset was on the right when looking at the horse ,to refute that I had to use your use of handedness .
Ultimately the horse is not facing the sunset , any sunset ,you can also see the entire horse without the sunset being on your right ,that understanding was achieved by using as many perceptions as necessary to show that others who were also using their perceptions and relying on the appearance got it wrong .