Preface (Vol 37, Issue 4).

In this issue, we first thank the reviewers for their hard work in handling papers during the year 2020 for the Visual Computer. Regular papers The following 6 papers have been submitted as regular papers to the Visual Computer Naoki Kita et al., titled: "Computational design of polyomino puzzles" (also presented at CGI2020 conference). SI: Learning representation from visual data We are happy to present 5 papers for the special issue "Learning representation from visual data" that has been handled by 4 guest editors who are: Dr. Wenming Zheng, Southeast University, China (lead Editor and Associate Editor of the Visual Computer). [Extracted from the article]