Hi 842U,
I am not sure if this is the best way to contact you, but I am new to navigating this part of wikipedia. I want to ask for your permission to reproduce the image you contributed for the entry on the Ha-ha Wall. The reproduction is for a piece of academic writing where the wall is an analogy for the different perceptions of a problem by a teacher and a pupil. I have modified the image slightly to increase the distance between the figure and the wall to more effectively impress the idea that the obstruction is not visible from their perspective (further irritating and alienating the pupil in my analogy). If you consent then I would also ask how you would like to be credited in my references.
Cheers, Will