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While [[schema L]] and the other schemata which are produced in the 1950s can be seen as [[Lacan]]'s first incursion into [[topology]], topological forms only come into prominence when, in the 1960s, he turns his attention to the figures of the [[torus]], the [[moebius strip]], Klein's bottle, and the cross-cap.<ref>{{L}} ''[[Works of Jacques Lacan|Le Séminaire. Livre IX. L'identification, 1961-62]]'', unpublished.</ref> Later on, in the 1970s, [[Lacan]] turns his attention to the more complex area of knot theory, especially the [[Borromean knot]].