I remember, as a child, hanging on to one specific party balloon for what seemed like years. I don’t remember how or where I acquired it, but it had initially floated high, bobbing against the ceiling, and, over time, lost its buoyancy, coming to rest on the carpet. Yet, when a family friend asked if they should pop the now sad-looking balloon, I assumed they were joking – like when an adult asks, teasingly, if they should eat your last slice of birthday cake – and was distraught when they followed through. I didn’t care that it had become grubby and partly deflated – I’d had that balloon for what felt like for ever.

This, it turns out, is the problem with many balloons. Not that clingy young children might become over-attached to them, but that they are often a single-use plastic – and even biodegradable alternatives such as latex balloons do not decompose quickly, meaning they can pose a significant risk to wildlife and the environment. In 2019, scientists found that balloons eaten by seabirds are more likely to kill them than other kinds of plastic – yet they do not seem to have been earmarked in the same way as, for example, plastic straws. If anything, balloon-based decor has become more popular in recent years, with balloon arches or tunnels deployed not just at birthdays but at events ranging from baby showers to shop openings. Balloon drops are used at New Year’s Eve celebrations and graduation parties, and balloon releases have also endured – particularly at funerals, where the unleashing of helium-filled balloons signifies the letting-go of a loved one.