This is a vintage glass art piece titled "Lucid Lines" by Virgil Thrasher, created in the United States in the 1970s. 

This three-dimensional shadow box combines the "reverse glass" technique, where the artwork is painted on the back of the glass, with a wood-grain background that adds depth. The silhouettes of standing trees on the glass surface and the warm back panel overlap, creating a rich variety of expressions depending on the viewing angle and the way the light falls. 

It creates an atmosphere perfect not only for your home but also for store displays, as an accent for mid-century and vintage interiors. Since it comes with a hanging bracket on the back, you can display it right away upon arrival.