Something a little different to ID?

Check this one out guys,its around six mil and then the extensions,so the longest from one extension to the other from right to left is around 40 mil.

I have had it for over a year and find the weird little thing amusing.

Any opinions as to what it is?

Interesting....

Does it move around like a urchin?

Do the extension move independently ?

It hasn't moved in the whole year it has been in there.
It is soft and spongy.
I try to move it and the extensions just stretch and so i stop so it doesn’t harm it.
To the best of what i can see it harms nothing at all.
I assume it's an opportunistic feeder as in planktonic maybe.
I have sat fish on it to see if it has a sting and it harms nothing, including my more sensitive wrist skin.
The extensions reach out and contract very slowely.
And it is in the shade always.