Mario M. Muller and Randy Twaddle have known each other for a relatively brief time, but their artistic output over the past 30-plus years has carried on a continuous dialogue. Muller is an artist, writer and curator who lives and works in Los Angeles. He has exhibited extensively nationally and internationally, and his paintings are held in major collections and museums. Among his many endeavors, he edits a witty art blog called TruffleHunting.

Twaddle has lived and worked in Houston for 25 years. He is well known for his iconic drawings of transformers and power lines that are ubiquitous in the urban landscape. Twaddle's work is widely exhibited and is included in many private, museum and corporate collections.

Few artists have subjected themselves to the discipline and formal economy of using just black and white as their elemental colors of expression. Muller using India ink and Twaddle using charcoal, gouache and watercolor have done just that. They relentlessly explore the reductive complexities of monochromatic icons.

On view through Jan. 3, 2015.