I have a hard time imagine the shape of dark-matter. What does that look like, a particle iceberg squeezed into a hidden dimension that surrounds all things? Li

I have a hard time imagine the shape of dark-matter. What does that look like, a particle iceberg squeezed into a hidden dimension that surrounds all things? Like a Neutrino that does not travell, but instead waves like seaweed? How does it look in 3dimensional terms?