 In response to Alspector-Kelly, Kusch (2015) insists that the constructive empiricist can rely on science to determine what counts as observable, without at the same time countenancing the microscopic as observable. That’s because “the phenomenon of naked-eye observation calls for one (kind of) theory; the phenomenon of instrumentally-aided eye-use calls for at least two (kinds of) theories: the theory covering naked-eye observation and theories of the instrument and its interaction with our naked eyes” (179). As noted earlier, constructive empiricists value epistemic modesty. If a constructive empiricist can rely on science to give us an account of the kind of unaided observation in which all science is grounded, without at the same time having to make use of scientific theories that go farther afield, then by the constructive empiricist’s lights, that more modest invocation of science is to be preferred in deciding the question of observability.