large Foam core boards to brainstorm ideas. Ikea Benjamin stools hacked to keep the boards upright. They can still be used as stools when needed and are also great for creating temporary walls for project spaces.
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The IKEA Benjamin stool is one of those super versatile pieces that comes in handy when you have kids. (I checked the IKEA website and it doesn't look they're selling the Benjamin stools anymore, but perhaps you already have one at home.