Homemade Sand/Water Table

To keep the Wee Bairn entertained this summer in our Wee Backyard, I cobbled together a sand and water table out of an old planter and some bins from IKEA.

Now I've got a space between the two bins that won't fit another bin, but looks a little sad.

Any thoughts on what should go there? The gap is about 14 1/2 inches deep and 10 7/8 inches wide.

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