The sentence uses figurative language and a rhetorical question to emphasize perspective.
A teacher entered the classroom and placed a small black dot on the whiteboard. He asked the students, "What is this?" Everyone answered in unison, "A black dot." The teacher said with feigned surprise, "Do you only see the black dot? What about this large white board that everyone seems to have missed?"
[Reflection]
What is it that you see? Everyone has flaws, but which ones do you focus on? Do you only see the "black dots" in others while overlooking the vast "whiteboard" of their virtues? In reality, everyone possesses many strengths. If you change your perspective, you will discover much more.
一位老师走进教室，在白板上点了一个黑点。他问学生们：“这是什么？”学生们异口同声地回答：“是一个黑点。”老师故作惊讶地问道：“难道大家只看到了一个黑点吗？这么大的一片白板，你们都没有看见吗？”
〔默想〕
你看到的是什么？每个人身上都有缺点，但你关注的是哪些呢？你是否只看到了别人身上的“黑点”，却忽略了对方拥有的如白板般广阔的优点？其实每个人都有许多闪光点，试着换一个角度去看待世界，你会发现更多美好的事物。