This one’s a crowd pleaser. There’s something about funneling layers of rainbow sand into an old glass bottle that brings out the mad scientist in everyone. There’s not much to it:

Materials

Colored sand (you can also use natural sand or salt and color it with food dye)

Recycled bottles

1″ to 1 1/2″ corks (recycled wine bottle corks also work)

funnel (we only had a single metal one so we also rolled paper into funnels)

That’s it. You just pour and layer!

See what I mean about mad scientists?