Incarnations of instantons

Yang-Mills instantons in a pure Yang-Mills theory in four Euclidean space can be promoted to particle-like topological solitons in d = 4 + 1 dimensional space-time. When coupled to Higgs fields, they transform themselves in the Higgs phase into Skyrmions, lumps and sine-Gordon kinks, when trapped inside a non-Abelian domain wall, non-Abelian vortex and monopole string, respectively. Here, we point out that a closed monopole string, non-Abelian vortex sheet and non-Abelian domain wall in ^S1, ^S2 and ^S3 shapes, respectively, are all Yang-Mills instantons if their ^S1, ^S2 and ^S3 moduli, respectively, are twisted along their world-volumes.