Carefully, says Mr. Randolph. 

We can't emphasize that point enough.  Carefully cut each piece and really do make use of the straight-edge for not only cutting out the pieces, but also for scoring the pieces along "fold" lines.

Cut out piece 1 through 22, which will form the bars of the framework for the clock.  Cutting the "fold" lines as accurately as possible is important: when you form the poles, any swerve or unevenness in the folds will torque the poles and even a little torque can make assembling the frame frustrating.  Fortunately, some twist will get corrected when the whole frame comes into place and is glued together.

The Escher-esque Figure 1 and Figure 2.

Piece 9 typo: At the end flaps, where "e, c, f, h" is marked, the scoring lines should be ++++ instead of ----.

Cut out and assemble Pieces 23-26.  These will make a wall bracket.  The arms on the bracket stick out and the framework will rest in top of those arms.

The Penrose-triangle Figure 2.

At this point, you can also assemble pieces 29-32, which will eventually become the parts that keep the hands of the clock in place.

Also, in the instructions here, Mr. Randolph suggests seeking out a whole series of piece and piercing the centers with pinholes, to help you locate the centers on both sides later.  Definitely do this!! I'm not kidding.

And tamp down that feeling of accomplishment and euphoria.  You're only at piece 32.

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