There are many ideal ways to spend a sunny summer weekend. One is to visit the beach, another to watch the cricket at Lord's or the Wimbledon tennis (quaint British customs), a third is to set fire to the garden with your annual barbecue. But perhaps the most fiendish of all sunshine pursuits is to attempt to come up with a witty answer for our world famous (our words) caption competition.

So please put your thinking hats on and tell us what is going on in this picture. A quick clue: the image is taken from the Splendor Solis,a  famous alchemical manuscript made in Germany in 1582 (Harley MS 3469). The manuscript in question is currently on display in Berlin (until 23 July). But what exactly is going on here? Answers via Twitter please or through the comments page below this post. We'll retweet and publish the best (and most amusing) answers.