2.1.4 - Opening the Door
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Hint:
Use what you learned outside with the three gazebos.  As usual, the notebook
gives a useful clue.

Objects needed: Generator, stencils, gems.

Explanation:

After powering the machine, you have to put the gems in the front, and the
stencils in the slots above them (each next to a grayish "clip" along the
top brass bar running horizontally near the top of the machine).  But how do
you know which goes where?

The gazebos, and their roofs.  After they were correctly aligned, each one
had a certain stencil displayed in it, which can no longer be moved.  The
left most one goes in the left most slot, etc.  And the the color of that
gazebo's roof matches on of the gems, which goes under the stencil slot.

Solution:
Click the top of the machine and stick in the generator to power it.

In the left slots, stick in the blue gem, and the stencil which looks like a
half circle, teardrop, paisley, comma, etc.  It also has a dot in the middle
but then so do the other two.  (Why?  The left gazebo had that symbol in it
after being activated, and it had a blue roof.  This is why the usually
black ink notebook colored the roof and gem.)

In the middle slots, stick the red gem and the stencil that has a V at the
top of it.

On the right, put the green gem, and the stencil that looks kind of like a
"J" or "T"

Now, click the bars on the left or right of the machine to activate it.  If
you've done it correctly, after the animation of it shooting at the door,
the orb on the front of the door should change from black to green.  Also,
you won't be able to activate the machine anymore, because you don't need
to.

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Stand in front of the door, and look down and to your right.  There's a
lever there.  Grab it.  Although you could go through the door now, there's
no reason to yet.

Go upstairs.

This room is part (and only part) of another puzzle, a big one this time.