Stool

 is an item in Broken Age.

Obtaining
Return to the Lumberjack's House, give Curtis the Driftwood. He will make a stool out of it and give it to you.

Using
After Returning to the Lumberjack's House, go to the talking tree. Hang the Bucket on his nose and show him the stool to make him vomit sap. This will turn the Bucket into the Bucket of Sap.