Take for example these two gray rectangular columns.

就拿着两个长方形灰色格子举例吧。

youdao

Undulating paths lead through 2, 700 gray columns of varying height, making a visit to the memorial a suitably unsettling experience.

CNN: Berlin: What to see

The New Amsterdam Room, originally the men's smoking retreat, is a marvelous elliptical space ringed with rotund plaster columns resembling gray Caen stone, and murals of New York from Dutch days to 1900.

WSJ: Miracle on 42nd Street | By Ada Louise Huxtable