TIME IS MONEY.

Time is money. That is what it is called.

So either you have to keep ur wallclock really low to be able to put in those pennies, or keep your piggybank high up to be able to easily see the hour.... Guess it encourages a bit of exercise.

Source: http://www.atypyk-e-shop.com/boutique_us/fiche_produit.cfm?ref=AT2354&type=4&code_lg=lg_us&num=0