This is not a Suzuki X-90 painted in a special color scheme and handed out as a reward to the top Mary Kay saleswoman in the southeastern Toledo region. It’s not even a golf cart specially designed to deliver daiquiris to the discerning divers off the Maldives.

No, the Rinspeed BamBoo is none of those things. But it is a rolling billboard that purports to be modern art. And from its waterproof, inflatable roof to the Swiss Army knife that doubles as a key, it’s cloyingly cheeky.

Of course, the folks at Switzerland’s Rinspeed already know that. “This car irritates,” begins the announcement of the...