The Ottawa Convention Centre’s fantastical facade of fenestration is a lovely example of the way a pattern of triangles can be assembled to form all sorts of other surfaces with complicated geometries. From the standpoint of symmetry and group theory, it’s quite elegant; from the standpoint of a passer-by on the street, it seems a bit sinister.
Decaseconds 
I feel like I have a thousand eyes.
A building-sized insect’s compound eye.