Surely they're not just for decoration, are they? No, they're some sort of switch. But what on earth for?

[ She gives the top of the stove a little tap – thankfully it's not actually hot yet, so we're saved the horror story that might've otherwise been. ]

It's smooth glass... and it has these little circles... could it be for– oh! Goodness, look at that!

[ And just on cue, one of the burners suddenly lights up red as it starts getting nice and toasty. ]