Richard Feynman's blackboard at the time of his death represents not only his unfinished thoughts but also encapsulates his curiosity and lifelong quest for understanding. His famous motto, 'What I cannot create, I do not understand,' highlights his belief in the importance of comprehension and creativity in mastering complex subjects. Comments reflect a fond admiration for Feynman, noting the significance of his ongoing learning, even about concepts like the quantum Hall effect. The shared experiences about whiteboards suggest a nostalgia for physical tools that aid learning and creativity, and there is a general sense of respect for Feynman's legacy in encouraging rigorous understanding of science. This post evokes discussions about teaching and the intrinsic connection between understanding and the ability to convey knowledge.