The "Grebigol" is a Literacy - Art - Learning Skills - Science - FUN lesson which I picked up years ago from Larry Swartz, one of my very excellent pre-service instructors at OISE. It is one of those rare lessons I still use -- nearly unchanged -- to this day.
When Larry introduced the lesson to us at the faculty nearly 20 years ago, he did not give all groups the same materials. It was frustrating to some of us that a few of the groups had scissors, or glue, or tape, while others had to make due without. As a teacher, I am focussing now more on the social justice lens of this contrived inequity, as a springboard for discussions about entitlement and privilege (both with teachers and with students).