Interlocking Concertina Towers, originally uploaded by HisCheapMoves.

Paper: Some dark-red metallic band bio (8.5″ x 11″)

When compressed, the profile looks like an exaggerated ‘S’. As it expands, the curves contract, eventually making a full circle. They interlock well.

This particular paper was colored the same on both sides; if I use something colored on one side only, each tower will be a different color.

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