A black hole is a place in space where gravity pulls so much that even light can not get out. So black holes — that suck up everything that's around — are represented by a black circle that drawn the text around. And because they doesn't only attract objects but also light, this booklet is printed on a mirror paper that reflect light except on that black circle that grows up as we turn the pages.

In physics, a wormhole is a speculative structure linking disparate points in spacetime, and is based on a special solution of the Einstein field equations. A wormhole can be visualized as a tunnel with two ends at separate points in spacetime (different locations, or different points in time, or both). So, in this booklet about wormholes there is a hole going through all the pages, as a short link between the beginning and the end of the book.

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