Glass is a transparent stable form of Silly Putty.
Silly Putty!!!! Oobleck!!!
No doubt you were just waiting for the right time to toss that old non-Newtonian fluid into the mix!
Now might be the time to bring up thixotropy and some other non-Newtonian pseudoplastic fluids.
Ketchup? Yogurt? Quicksand!!!
Fun is where you find it.
“Silly Putty is a toy based on silicone polymers that have unusual physical properties. It bounces, but it breaks when given a sharp blow, and it can also flow like a liquid. It contains a viscoelastic liquid silicone, a type of non-Newtonian fluid, which makes it act as a viscous liquid over a long time period but as an elastic solid over a short time period”