  One of the leading ideas for the beginning of the Universe is the
Hartle-Hawking `No-Boundary Proposal.' Since the Cobordism Conjecture claims
that any spacetime allows for a dynamical boundary, we suggest that one may
equally well consider a `Boundary Proposal'. Specifically, the corresponding
euclidean instanton is a sphere with two holes around north and south pole cut
out. Analogously to the Hartle-Hawking proposal, the sphere is then cut in two
at the equator and half of it is dropped. The equator is glued to an expanding
Lorentzian de Sitter space, implementing a beginning of the Universe with a
spacelike spherical boundary at its earliest moment. This process is in
principle on equal footing with the one based on the no-boundary instanton. In
fact, if the Linde-Vilenkin sign choice is used, this `Boundary' creation
process may even dominate. An intriguing implication arises if tensionless
end-of-the-world branes, as familiar from type-IIA or M-theory, are available:
Analogously to the Boundary Proposal, one may then be able to create a compact,
flat torus universe from nothing, without any exponential suppression or
enhancement factors.
