Puzzle comprising overlapping circles with interchangeable components

A puzzle having at least two overlapping circles, each circle being defined by a number of petals and a number of triangles, each petal being formed of two arcs which are portions of a circle of the same circumference as the circle, each triangle having faces each being an arc complementary to the arc of the petals, the arrangement being such that adjacent circles have common components which, by selective rotation of either or any of the circles, can cause spatial displacement of the common components, the petals and triangles having complementary tongues and grooves, and the circles comprising the puzzle are located in a base which has a peripheral tongue or groove complementary to that of the adjacent petals, the lower base member has at least one upwardly directed partial annular ridge associated with each circle, each triangle has a downwardly depending extension adapted to abut and be guided by one side of the ridge over a substantial part of its rotation, and each petal has two downwardly depending extensions, symmetrically located thereon, each of said extensions being adapted to be guided by one side of the ridges over a substantial part of its rotation, the spacing between the extensions being equivalent to the spacing between the associated upwardly directed annular ridges of the adjacent circles.