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Domains in Langmuir monolayers support a texture that is the two-dimensionalversion of the feature known as a boojum. Such a texture has a quantifiableeffect on the shape of the domain with which it is associated. The mostnoticeable consequence is a cusp-like feature on the domain boundary. We reportthe results of an experimental and theoretical investigation of the shape of adomain in a Langmuir monolayer. A further aspect of the investigation is thestudy of the shape of a ``bubble'' of gas-like phase in such a monolayer. Thisstructure supports a texture having the form of an inverse boojum. Thedistortion of a bubble resulting from this texture is also studied. Thecorrespondence between theory and experiment, while not perfect, indicates thata qualitative understanding of the relationship between textures and domainshapes has been achieved.Comment: replaced with published version, 10 pages, 13 figures include

Boojums and the shapes of domains in monolayer films