Object Lessons is a series of short, beautifully designed books about the hidden lives of ordinary things. The ocean comprises the largest object on our planet. Retelling human history from an oceanic rather than terrestrial point of view unsettles our relationship with the natural environment. Our engagement with the world's oceans can be destructive, as with today's deluge of plastic trash and acidification, but the mismatch between small bodies and vast seas also emphasizes the frailty and resilience of human experience. From ancient stories of shipwrecked sailors to the containerized future of 21st-century commerce, Ocean splashes the histories we thought we knew into salty and unfamiliar places. Object Lessons is published in partnership with an essay series in The Atlantic. Mentz takes us on an invigorating 'adventure in thinking,' across vast temporalities and aquatic expanses, rich with strange confluences, and haunted by the terrors of 'wet globalization.' Against the impossibility of understanding the ocean, he casts an inventive blue humanities that lures us with its histories, poetry, theories, queer couplings, exultations, and immersive practices.