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as a strings player it always makes me wildly happy when kyoani gifts us with shots of sapphire's bow. bows with all-black hair are typically only used by contrabass players, and while all string instruments require different grips on the bow, the bass grip is the most unique. the attention paid to articulating and animating all the little highlights in the underside of the hair (i.e. the part that doesn't touch the strings) where there's less dust from the rosin is the frosting on the cake.

plus you can even see at the beginning of the clip where sapphire is playing pizzicato instead of arco, her grip on the bow with the rest of her hand is still correct even though it's a big partially-cgi crowd shot and she's all the way in the back! based kyoani verisimilitude... this episode was truly out of this world and i'll be grateful for it forever.