In addition to using optical illusion, he often presents his art by adding new technologies, such as augmented reality and video mapping.
[2] Leon generally paints contemporary themes which involves environmental concerns and raises questions about the livability in this world.
Leon Keer is one of the world’s foremost artists in 3D Street Art, the master of optical illusion.
At 2010 festival in Sarasota he made a surreal street painting with Little Red Riding Hood and Alice in Wonderland together, fighting against evil as main characters in the image.
[7] Experimenting with augmented reality combined with anamorphic art[8] 3D mural 'Shattering' with AR made by Leon Keer in Helsingborg[9] Malta Gummy bears – artist Leon Keer created 3D art for Malta street art festival[10] Keer is often confused with Ego Leonard,[11] the anonymous guerilla artist.