I do not know if this is bug or what, but it is VERY confusing for me. I do not know what fields can be worked by the city. This is VERY important when you make a new city, one HAS to understand what is reachable by it and what is not.  In the example below, I would think that I should not be able to access the air shard - it is outside of the sphere of influence, yet, the build interface shows that I CAN build it (if I had money that is, it is gray because I do not have 100g). At the same time, I should be able to build a farm on fertile land (top corner), but it is not shown as an option. Please note, that for whatever reason I could build a metal mine which looks in similar position (top right) - next to the border, and not adjacent to the other buildings. So, I am COMPLETELY lost - I have no idea why I can build some buildings, and can not some other.

On related note, if some building requires technology, there must be an easy way to see it.