Do not lean on the walls
Walls are abundant in museums (obviously), but they are not for you to lean on. Although museums can be cumbersome and tiring, avoid leaning on walls, with or without art. If you do not have stamina to stand, simply sit down on a bench.
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Do not eat, drink, or vape
Accidents can happen, no matter how careful you are. Eating and drinking has long been banned, but the vapors from an e-cigarette could greatly harm the paints, materials, and artifacts along the walls. Most museums provide wonderful cafes and restaurants, as well as outdoor areas, that are better suited for these activities.