A one-way plexiglass wall.

PennaGroup, a construction firm in Fort Worth, Texas, imagines a wall made of wire and a one-way sheet of plexiglass.

According to PennaGroup's summary of the design, the wall would work like a one-way mirror. People on the US side would be able to see through, but those on the Mexico side would not.

The company interviewed dozens of US Border Patrol agents to understand their jobs and what kind of characteristics they would want for a wall. PennaGroup then designed one that's tall, can drain rainwater, has mechanized doors for vehicles, and is hard to climb, tunnel under, or tamper with.

"The wall was designed with Neoclassical architecture influences encompassing the styles of federal and Greek Revival architecture that were a major influence during the late 18th and early 19th centuries in Washington, DC," the summary reads.