The photos of the Campi Bisenzio floods near Florence were taped to the case protecting the painting.
The pair were arrested.
Ultima Generazione (UG) has staged a series of controversial headline-grabbing protests in the last two years including pouring red liquid over themselves outside Florence cathedral and gluing themselves to the iconic Laocoon statuary group in the Vatican Museums.
In May last year a protest at the Giro d’Italia by three UG members was thwarted as the trio was dragged away from the road at Meolo near Venice before they could stop a breakaway group of four riders from racing past.
Earlier that month UG staged another act of civil disobedience to highlight the need to tackle the climate crisis when two protestors covered themselves in mud outside the Senate in Rome.
Three UG members are currently on trial in Rome for spraying easy-to-wash-off paint over the facade of the Senate last January.
Last October, several UG activists were fined 3300 euros each for public indecency after stripping naked and blocking traffic in a flash mob on a central Turin bridge.
Other UG members were indicted for spraying wash-offable paint over Maurizio Cattelan’s L.O.V.E. sculpture in Milan a year ago.
In a bid to discourage such actions, the government recently introduced a bill that would levy fines of up to 60,000 euros on anyone damaging Italy’s cultural heritage.
The bill was slammed as disproportionate and vindictive by the opposition.
ANSA