Bonding with Sigma Type 1 Units
Sigma bonds, in actual chemistry, happen when two atoms share a single electron in each of their respective S orbitals. In Origamic Chemistry, this is represented by either of two different bond units depending on how the atoms need to be rotated with respect to each other.
This demonstrates how to attach atoms together with the first type of sigma bonds and in the process you'll build your first molecule: H2O - Water.
On one side of the bond - in this case, the hydrogen - one point of the bond unit goes into the pocket on the atom unit going the opposite direction that the atom points go in. On the other side, to points of adjacent bond units combine and go into each pocket of the atom unit, again in the opposite direction that the atom points go in. The atom points then partially cover the bond unit and the combination results in two atoms that are well connected.
Taking one of the bond units, tuck the combined point into the pocket on the atom - this goes into the pocket in the opposite direction that the atom point does.
First point going in
Take the atom point and put it in the same pocket as it would normally go, covering a part of the bond unit in the process.
The part of the bond unit that goes into the pocket is now covered. The two branches of the bond will go into the other atom.
Same thing with the next bond unit, stuff that middle point into the pocket
The next bond unit going in
Cover this one, too
Hopefully you're getting the hang of this... cover up part of this bond unit by sticking the next atom point into the pocket.
The middle point on the third bond unit goes into the pocket on the last available atom unit.
Stick that last atom point into it's pocket
One side done
So that's got the one side done. Notice how the points of the zig-zag branch of one bond unit overlaps the point on the straight branch of the next bond unit over.
Head on view
The overlapping points will go into the pockets on the connecting atom together as though they were a single point
So, now we start attaching modules from the second atom. Take both of the overlapping points and tuck them into the pocket.
In The Pocket
This is how it should end up.
Same thing, slide both of the overlapping points into that pocket...
Sliding it in
DofT has found that it's easier to start it at the end and slide it into place...
In The Pocket
Eventually it should end up like this. It gets tricky with all these layers so once this is in position, make sure that the the bond units go completely into the pocket so that you'll be able to get the atom point in over it.
The point from the second atom module should now be put into it's pocket, covering part of the bond modules in the process.
Here's the atom point going into it's pocket over the bond module
Last Atom Module
Finally, slide the last two overlapping bond points into the last atom pocket.
Slide it in
This is easier, again, if you start at the end and slide it into place.
Point into Pocket
Take the next atom point and put it into it's pocket, covering part of the bond units in the process.
Once it's all the way in
One last point
Take the last atom point and put it into the last remaining atom pocket, covering the last of the bond units in the process
Tucking that last point into that last pocket.
Now you have one atom bonded to a part of another atom. Assemble the rest of the atom, including any other boded atom parts, as you would normally.
Attaching two hydrogens to an oxygen give you a completed molecule of water!