铅笔再美好也只是黑白
[qiān bĭ zài mĕi hăo yĕ zhĭ shì hēi bái]
Literal translation would be 'no matter how good the pencil is, it only draws in black and white.' Metaphorically speaking, the beauty created is still limited and simple compared to real life's colorful experience; this may suggest contentment in simple beauty or express nostalgia.