1.ETS1.B and 1.ETS1.C Engineering practice considering the shape and material a device is made from. In this activity, older students GUIDE first graders to make lava lamps using simple supplies. The focus is on considering that they have to "funnel" the liquids into the bottle (without using the word "funnel" to prompt them). We let them try paper funnels first and then let them come up with the idea of using real plastic funnels so they don't soak through and make a mess. You'd be surprised how well paper funnels (rolled up sheets of paper) actually work - one time.