Earlier intermittent research on such carbon molecules provided only evidence of their existence in the gas phase. In 2019, the successful generation and clear imaging of cyclo [18]carbon (C18) in condensed phase quickly sparked a research boom on cyclocarbons. Subsequently, in the past four years, due to its attractive aesthetic structure and potential application prospects, a large number of property predictions and synthesis attempts for C18 and its analogues were emerged. Thereinto, our group has conducted extensive and in-depth theoretical research on C18 ring and related systems, and achieved significant results. Very recently, three smaller carbon rings, i.e., cyclo [16]carbon (C16), cyclo [14]carbon (C14), and cyclo [10]carbon (C10), have also been prepared and characterized in the condensed phase, which is bound to trigger another wave of research enthusiasm for cyclocarbons.