Teach Children to Obey Commandments and the Law using a marble that you spin first with a plate, then in a bowl. Boundaries keep the marble inside. Would be great for showing kids why parents set rules for them.
The Need/Want Glass from Alesina Design encourages you to think about wasting water every time you take a drink. By holding your finger over a hole in the glass, you consciously permit yourself to have more water than you might ‘need’.