Sorry, I'm not surprised by the $100,000 cost for what we got. Anything that large that you would want to last for 15 years (or longer) would have cost 10 times that amount. Like anything, you're not just paying for materials when you get public art, you're paying for design and for manufacturing too. It adds up quickly, and for something that has seven three-metre high letters and which is able to withstand some average adults climbing and reclining on it—and which doesn't short out when it rains—$100,000 seems about right. Put a foot in the wrong place though, and you'll get scuffs and worse.
The question will be whether it makes sense to just replace this sign with a similar one (no design cost) next time, and the time after that, and the time after that, or whether to spend a ton more to get something "permanent". The average piece of public art in this City is built to last forever, and costs like it is.
My take is that if they are going to allow people to climb on it, that the structure should be beefy enough to handle it without collapsing, but that the surface should be somewhat cleanable but ultimately easily replaceable as you never know who is going to mark it up in what ways with their shoes, boots, etc. It's always going to get marked up, and sometimes in a way that's not possible to clean. The average person is not going to wreck the letters, but not everybody is average.
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