Go on a walk to search out some naturally occurring bubbles. Depending where you live you may find bubbles in the waves at the sea, in waterfalls, weirs, mill runs, spas, locks or streams. While you're walking, see how many bubble-shaped things you can see. Give marks for the most unusual or outrageous bubble-shape spotted: let each family member put forward their argument for allowing an object into the list, while the others debate its merits. For example, are VW Beetles the best bubble car, or are Smart cars in contention as well? What's the bubbliest-shaped leaf between lime and young eucalyptus?
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