Receding Columns Toward Arched Opening, Satisfying c. 1970s Graphite Architectural Sketch

I've been digging through and sorting some old piles of paper accumulated here and there over time and found this drawing, which I know was pulled from a small sketchbook, c. 1970s. It struck me anew as really a nice little sketch, dashed off quickly I am sure but to my eye perfectly concise. What's more the essence of things than a long walkway with a threshold to cross (or a void to confront!) at the end? Feels to me like a good one to frame up and live with.

6" x 3 7/8". Excellent condition, bright and crisp, graphite on light-weight sketchbook paper.