You probably have made slime before. We make it with glue, starch and water. My grandfather would be happy to know if you use Borax in your slime fun. But, we spice it up a bit with metal filings!
The nice thing about having the space at the store is that we were able to let the magnet sit with the slime over a week! The picture above is after 24 hours. Notice that the gray color by the magnet is much darker than the gray still in the slime. It attracted a lot of the filings over the first day.
You can clearly see two circular arcs also. This shows where the magnetic fields were able to attract the slime to the magnet. Where there is still grey, the magnetic fields were not strong enough to move the filings.
This experiment shows how magnetic fields are circular.