Vote for the toy churn system

I HAVE just spent half an hour watching my nephew Charlie, aged 14 months, playing with a small tin churn with a lid. Until recently the churn held some toffees.

Charlie repeatedly places a small plastic toy into the churn and then puts the lid on.

Then he takes the lid off and, lo!, the toy is still in the tin churn. He then takes the plastic toy out and repeats the process.