The Guide's entry on mazes: essentially a metaphor for travel, though compressed. You don't know where you're going. Choices are made on incomplete information. Unexpected things are found. Occasionally you retrace your steps.
This is identical to every journey the author has taken, including the ones with a plan.
Inside: eight blue plaques — wisdom from strangers across the world. A relic on a plinth. Your starship waits at the entrance. Find the exit and it waits there too.
"The Guide updated Earth from 'Mostly Harmless' to 'Actually Rather Wonderful, All Things Considered' after a researcher spent three weeks travelling alone without reading the news."