 One should also note that Grünbaum took the job of showing that modern mathematics describes space and time to involve something rather different from arguing that it is confirmed by experience. The dominant view at the time (though not at present) was that scientific terms had meaning insofar as they referred directly to objects of experience—such as ‘1m ruler’—or, if they referred to ‘theoretical’ rather than ‘observable’ entities—such as ‘a point of space’ or ‘1/2 of 1/2 of … 1/2 a racetrack’—then they obtained meaning by their logical relations—via definitions and theoretical laws—to such observation terms. Thus Grünbaum undertook an impressive program to give meaning to all terms involved in the modern theory of infinity, interpreted as an account of space and time.