When viewing the image above through a prism held horizontally at the correct viewing distance, the colours in the set of triangles on the left will turn blue and yellow, while the colours in the triangles on the right will turn cyan and red. As shown in the image below.

When viewed through a prism held vertically at the same viewing distance, the colours in the set of triangles on the left will turn cyan and red, while the colours in the triangles on the right will turn blue and yellow. The colours flip from one side to the other as shown below.