Maria Montessori was an Italian doctor who totally renewed the teaching methods of the early twentieth century. Her philosophy and her method have been very inspiring for me as a mother, but also at business!
She used to give glasses and glass jars to children convinced that this was the way they’d learn to be careful, aware of their movements and the consequences that they could have. Glass can break, so you have to be careful with it.
The same happens with adults. When we use fragile objects, we unconsciously are more careful with them, and what is more interesting is that if we are more careful with objects that surround us, this will lead us to be more cautious with ourselves.