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“Hard Truths” is sublime and soft in the way that a rough surface is smoothed to the touch by sandpaper.

The team used 31 industrial sandpapers with surfaces of varying roughness, ranging from 1 to 100 microns thick, as experimental targets.

Start with coarse sandpaper — maybe 80 grit — and work up to progressively finer grades, ending with 400 grit.

The voice of Michael McDonald has been compared to velvet, silk and sandpaper, melted chocolate and last year, by a besotted 11-year-old girl, an angel.

You’ll want clamps of various sizes to hold pieces together while drilling or assembling, along with sandpaper in a range of grits.