a definition of time

the exhibition consisted of 560 photos, all placed in one room, sorted in four fields: existence, relationship, desire and time. she went there on a tuesday afternoon, while the sky was a blurry white. the one photo that touched her most was black and white, named "time - a leather raft on the yellow river". she wanted to take a photo of it, but in this room of photography, taking photos was not allowed. so she just wrote down the words.
outside, the sky had turned to colour by the time she walked out of the one room again. on impulse, she tried a revolving door that belonged to the first floor. it lead to an inside square, then on to a stairway. up on the roof terrace, there was a chair, placed as if waiting for someone to visit it in the chill of December. time is a sole chair in front of a blue sky, she said, and went to get her jacket.