I represent cities and industry, but I am not a building. People think of me as bloody evenings.

I divide sky from earth yet touch neither, Always ahead, yet never nearer. I shift with the sun, retreat with the night, A constant line just out of sight.

I stalk through the dark, I slip into your home when least expected. My presence leaves a mark, at least when inspected. I am no thief, no matter what you say. In your walls, under floorboards, even in the ceiling, I'll stay.

I have ears and eyes, Yet I can’t hear or see. I’m a large empty space Filled with flowers - that’s me!

I'm not very big, so you can't feel my bite. Yet, allergists fear me. I am a...