THE INCREASING attendance enjoyed by art fairs is both blessing and bane for gallerists, who have to keep reminding visitors not to poke, prod, or — in the case of floor pieces — step on the art.

At Art Basel Hong Kong, Mona Hatoum’s Turbulence was a repeat victim as oblivious visitors walked over the floor piece and subsequently slipped on the unanchored glass marbles arranged into a circle. The attendant crash followed by the chorus of gasps became familiar sounds over the course of the fair.

To protect Ms. Hatoum’s €250,000 work, Galleria Continua went against the Lebanese-born Palestinian artist’s wishes and added a square border made of red tape to the installation. When that wasn’t enough of a warning, stanchions were erected. Mario Cristiani, co-founder of Galleria Continua, didn’t hesitate in identifying the cause of this rampant unmindfulness among fair-goers: “It’s because people are always on their cellphones.”

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At Silverlens, Patricia Eustaquio’s Shifting In, Sifting Through fared no better. Made from floor tiles, Ms. Eustaquio’s work was strolled over numerous times, to the ire of Silverlens co-founder Rachel Rillo. Commented Ms. Eustaquio: “For the art fair crush, it is a given that the work will be battered.”

The Instagram-ready appeal of art fairs (and exhibitions, in general) appears to have made matters worse. Intent of taking selfies, visitors sometimes accidentally grazed paintings and other wall-bound works (a risk that increased if said selfie-taking visitor was wearing a backpack).

But what really gets a gallerist’s goat is the deliberate molestation of a piece. That is, knowingly picking at a deliciously thick impasto painting, or knocking on a print mounted on aluminum (to check if it really is mounted on aluminum — yes, it is).

Fair organizers have requested patience from the galleries: attracting new audiences is the first step, educating them is the next. — SLM