Only thing to do on a hot day

Grandchildren, Dylan & Tomos, came around this afternoon to help us with the garden. Dylan in particular is interested in gardening and full of questions about the flowers and vegetables. After all the hard work they both loved their ice lollies.
I was impressed by all the credible guesses of  the identity of yesterday’s mystery object. Unfortunately, no one got that it was a close up of the prism of our car’s headlight.