Conclusion
4D Printing Materials

From ancient myths to science fiction, literature bears witness to the ambition of human beings to free themselves from their limitations, to stay healthy for a long time, to fly like a bird, to free themselves from arduous tasks, to explore inaccessible worlds, and so on. It is often assumed that what is not feasible in one era must be possible in the next. This has often been the case. The "dream-killer" role that puts the 4D concept to the test in this article, based on knowledge of what is real and what is possible, brings together the complexity of phenomena with the intimate responsibility of researchers not to engage in risk-taking above a low threshold. At best, interdisciplinarity or truncated or even absent systems approaches can be found in the literature. We're still a long way from Farid et al.