You can build a structure around a center, but bases go on the bottom of things, so you can’t base something around something else.
Similarly, you can’t base anything off of anything. Something is always based on something else.
based around
You can build a structure around a center, but bases go on the bottom of things, so you can’t base something around something else.
Similarly, you can’t base anything off of anything. Something is always based on something else.