I love this idea. I have two little kids, they always screaming or making trouble at home. Though time out is controversial, sometimes we have to choose this way. This is a calm and effective way for parents and school teachers to correct their negative behaviors. You can use a glass hourglass from local decor stores if you are using it as decoration, or if it needs to be kid-proof use clear soda bottles and a wooden bead in between. Click below link for tutorial…Time out stool Tutorial
Below video will show you how to make time out chair for kids.
If you’re not into the DIY version you can pick up a Time Out Timer Stool from Amazon.