There are rules for making constructions with Abies, but there are no serious consequences if you break them. In fact, many of the best structures are made by breaking them. As in society, however, there are some consequences when you break the rules.
Whether you like rules or not, it is good at least to know them. Here are the rules we followed when making larger Abies out of Abi-C’s and Abi-D’s. (Remember that an Abi-C has four identical faces and an Abi-C has three identical but smaller faces with the fourth one being the same as a face of an Abi-C, you can see this in number 01 of this blog).
Rule 1: an Abi-C may only be connected to the large face of an Abi-D. So, it may not be connected to one of the smaller faces of the Abi-D. This also means that it is not permitted to connect two Abi-C’s together.
Rule 2: two Abi-D’s may only be connected to each other with one of their three smaller faces. So, they may not be connected to each other with their large face.
Here I will later post some pictures of the connections that can be made breaking these rules. I have lent out my complete collection of Abies, so I cannot do this right now.
Rule 3: connecting faces have to cover each other. So, you may not rotate one of them relative to the other.
This little bird was made breaking all of these rules.

This construction was made abiding by all the rules.

The rules also apply to larger Abies. To comply with them you need to remember if a peghole originally belonged to a small face of an Abi-D; to the large face of an Abi-D; or to one of the faces of an Abi-C. For larger constructions this is not always easy. For example: of the three dark-green triangles on the left and the one light-green triangle, can you say which belong to an Abi-C and which to an Abi-D? Here is the answer: the dark green triangles belong to an Abi-C, and therefore may only be connected to an Abi-D. The light green triangle belongs to an Abi-D and since it is its large face it may therefore only be connected to an Abi-C. Don’t worry about it, you can enjoy playing with Abies without having all this in your head.
In general one can say that you can make larger structures when abiding by the rules and at the end you can further beautify them by breaking the rules. I will look for a nice example of that and also post it here later.








