He regularly incorporates digital processes into his work, which often start out as conventional drawings. After scanning, he continues to work digitally, layering lines, colour and collage into work that is multi-sensory, rich and complex.

Mercer has said; I'm really just a landscape artist at heart.

-The artworks are either colourful or black and white 
-Although it looks a bit complicated but when we look through it clearly, we can actually find a lot of buildings
-Most of his artworks are lines and building 
-The lines are just crossed each other and overlap each other 
-The colours he used are all very fresh and able to caught people’s attention easily especially City Lines V