Made for Ryerson Science Rendezvous 2013
To make this hollow biofilm 3D structure, I used three upside down styrofoam cups and bit off the edges and flattened them out a little by cutting the body vertically so they looked like hollow mountains. I drilled a hole in the middle of the glass bowl and inserted some LED lights to light the inside of the “biofilm cave” and pulled the wire through and attached button batteries underneath. Then I glued piece by piece the remnants of the alginate mold, liberally applied sprinkles, seeds, food colouring for the goopy bacteria effect. This is pretty close to what biofilms looks like if constructed with a confocal microscope.
For more science rendezvous activities: https://karenquinto.com/science-rendezvous/