A million tubes

I was out in my territory, when I spotted something strange - lots and lots and lots of colourful things, all in one spot.
My humans must've been doing something weird.

The colourful things were pink and purple and orange, and nearly all of them were tubes. I had a confused.

I sniffed them and they all smelt the same: they smelt of burning and damp.

I didn't know what they were, but I didn't want any other cat claiming them, so I made sure I sprayed them with wee.

Weird tubes.