Tiny Doors

So it seems people of the past used to be smaller. You look at historical buildings, and old furnishings, and they’re like small. And it seems comical to try to walk through their houses, and to sit in their chairs.

And then I think about aliens. When we reach that Star Trek phase of humanity. And we all inter-mix and interact with aliens of all shapes and sizes. 

How will we design our buildings? How do we build doors? How do we keep costs reasonable while allowing for a maximum of sizes and beings access? 

I have no answers. Just fun to think about.