Picking the bookshelves or display unit accessories is no less important than the bookshelf itself, so it will make a great difference if you vary accessories height, even if you have two items with same height that you love to put them next to each other, put one of them above some books or wooden/steel base to make it a bit higher, and you’ll have varying heights
Add real and faux greenery, the faux ones will blend in the real, they’ll all look real plants
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