L.J. Billion is an op art artist, who's identity is unknown. You can see him / her as a reflection in the photos of some works, but he / she is always wearing a dog mask, which has become a trademark.
L.J. Billion mainly works with plexiglass and mirrored glass. Most of his pieces are static, some have a kinetic aspect, and some contain light in the form of LED strips.
Some of the aspects L.J. Billions artworks (especially the T2AL series) examine, are the following:
Indirectness - what you see is not the work but the reflection of its environment, leading to the fact that, depending to time of day, lighting and surrounding, the piece virtually never looks the same.
Interactiveness - the viewers themselves become part of the work. They are displayed numerous times, each time from a slightly different angle, which animates them to take a physically active part in the artwork.
Repetitiveness - the work is a section of a whole in which the same structure is repeated potentially infinitely.
Other series examine other optical aspects. Find out by youself!