mc escher.
escher worked a lot through the mathematical view point of art with tesselations and repetition. he also worked a lot with wood engraving and lithographs. his pieces make you wonder how and why he created them. what stands out about his work the most for me is the complexity and the color. he likes to stay in black and white.
http://www.mcescher.com/Gallery/gallery.htm
robert morris.
"an image maker." robert morris works with just about any and all types medium previously ranging from very traditional pen and ink, photography, and digital design. his pieces have a very creepy feel to them. this picture is kind of disgusting to be honest, but at the same time it's intriguing and i wish i knew how to photoshop an image to look this incredibly real.
http://www.graphicmania.net/six-artists-six-revolutions-in-the-digital-surreal-art-history/