Where Ideas End and Expression Begins: The Ninth Circuit Revives Tangle's Sculpture Suit Against Aritzia

In Tangle, Inc. v. Aritzia, Inc., the Ninth Circuit reversed a Rule 12(b)(6) dismissal, holding that the selection and arrangement of otherwise unprotectable sculptural elements can be protected and that kinetic, manipulable works are sufficiently 'fixed.'

On January 14, 2025 (amended February 13, 2025), the United States Court of Appeals for the Ninth Circuit decided Tangle, Inc. v. Aritzia, Inc., No. 23-3707, reversing in part a dismissal entered by the United States District Court for the Northern District of California. The panel — Circuit Judges Lucy H. Koh and Anthony D. Johnstone, joined by District Judge Michael H. Simon of the District of Oregon, sitting by designation (Judge Simon also filing a separate concurrence) — revived a copyright claim that the district court had twice dismissed under Rule 12(b)(6). The decision is a compact but instructive restatement of two recurring fault lines in copyright: the idea-expression dichotomy as mediated by the selection-and-arrangement doctrine, and the fixation requirement as applied to works designed to move and change shape.

At a glance

Case: Tangle, Inc. v. Aritzia, Inc., No. 23-3707 (9th Cir.)
Decided: January 14, 2025 (amended February 13, 2025); on appeal from N.D. Cal.
Holding: A plaintiff plausibly states a copyright claim where it alleges a protectable selection and arrangement of individually unprotectable sculptural elements; kinetic, manipulable sculptures are sufficiently “fixed” for copyright purposes notwithstanding that they can assume varying poses.
Status: Copyright claim reversed and remanded; trade dress claim’s dismissal affirmed. Litigation continues in the district court.

Posture: a dismissal litigated to finality

Tangle, Inc. manufactures kinetic sculptures — familiar as desk toys and larger display pieces — assembled from a series of identical, 90-degree curved tubular segments connected end-to-end so that each junction rotates a full 360 degrees. Tangle holds seven copyright registrations covering sculptures composed of seventeen or eighteen such segments. After Aritzia, an apparel retailer, installed large twisting tubular forms in its store windows, Tangle sued for copyright infringement and trade dress infringement.

The district court dismissed under Rule 12(b)(6), granting leave to amend, and dismissed again after Tangle repleaded. Rather than attempt a third complaint, Tangle stood on its pleading and invited entry of an appealable judgment — a procedural maneuver the Ninth Circuit has long sanctioned under Edwards v. Marin Park, Inc., 356 F.3d 1058 (9th Cir. 2004). The posture matters: the panel reviewed only the sufficiency of the allegations, accepting them as true and drawing inferences in Tangle’s favor. Nothing in the opinion resolves whether Tangle’s sculptures are in fact protectable to the scope claimed, or whether Aritzia’s displays in fact infringe. Those merits questions — precisely the ones on which idea-expression and merger arguments usually turn — were left for discovery and, potentially, summary judgment.

Reasoning: the idea-expression line and the arrangement that survives it

Aritzia’s defense was the classic structuralist attack. Disaggregate the sculpture, it urged, and every component is an unprotectable idea or a functional given: the number of segments, their uniformity, the curved tubular shape, the proportions, the end-to-end connection, the rotating joints. Each, standing alone, is either an idea under 17 U.S.C. § 102(b) or dictated by the article’s function, and therefore outside copyright.

The Ninth Circuit accepted the premise but rejected the conclusion. Copyright, the panel reaffirmed, “protect[s] ‘expression’ but not the ‘ideas’ that lie behind it.” Yet the dichotomy does not require courts to atomize a work and discard it piece by piece. What is protectable, the court held, is the author’s “selection and arrangement of the [sculpture’s] otherwise unprotected elements.” Even where each ingredient is in the public domain or functionally constrained, an original combination of those ingredients may itself constitute an original work of authorship. Because Tangle alleged a particular creative arrangement and pointed to Aritzia’s use of substantially the same configuration — both sets of works featuring identical, connected, 90-degree curved segments — the complaint cleared the plausibility threshold.

Critically, the panel located the boundary of protection in the availability of alternatives. Tangle’s arrangements warranted meaningful protection, the court reasoned, because the chosen elements could be combined in a great many ways; the expression had not collapsed into the idea. That framing is the doctrinal hinge. It is, in substance, a merger analysis run in the affirmative: protection is broad where expressive choices are abundant, and it narrows — toward the vanishing point — where the idea can be expressed in only one or a few ways.

Doctrinal context: merger, scènes à faire, and the long shadow of Satava

The opinion is best read against the lineage running from Baker v. Selden, 101 U.S. 99 (1879), through the statutory codification at 17 U.S.C. § 102(b), to Feist Publications, Inc. v. Rural Telephone Service Co., 499 U.S. 340 (1991). Feist supplies the doctrinal engine Tangle invokes: facts are not copyrightable, but an author’s original selection, coordination, and arrangement of facts may be — albeit with a “thin” copyright that protects only against near-identical copying.

For three-dimensional art, the governing Ninth Circuit authority is Satava v. Lowry, 323 F.3d 805 (9th Cir. 2003), the glass-in-glass jellyfish case. Satava held that “[a] combination of unprotectable elements is eligible for copyright protection only if those elements are numerous enough and their selection and arrangement original enough that their combination constitutes an original work of authorship.” But Satava also delivered the cautionary half of the rule: where the elements and their assembly are largely dictated by nature or by the medium — there, jellyfish physiology and the glass-in-glass technique — the resulting copyright is “thin,” guarding against only virtually identical copying. Tangle sits squarely in this tradition. The panel embraced Satava’s recognition that arrangements can be protectable while implicitly accepting its premise that the scope of any such protection depends on how constrained the choices were. The merger doctrine and the related scènes à faire principle — under which stock or standard elements that follow inevitably from an idea or genre receive no protection — remain fully available to Aritzia on remand, now as fact-laden defenses rather than pleading-stage knockouts.

The second holding addresses fixation. Aritzia argued that a sculpture engineered to twist into countless poses cannot be “fixed in [a] tangible medium of expression.” The panel disagreed, reasoning that a movable work remains fixed so long as it is embodied in a material object perceivable for more than a transitory duration; the capacity to change configurations no more defeats fixation than motion defeats the copyrightability of choreography, motion pictures, or music. The court accordingly treated the sculpture as protected across its range of motion — a meaningful extension of fixation analysis to kinetic and interactive objects.

Finally, on substantial similarity, the panel applied the Ninth Circuit’s two-part framework but observed that at the pleading stage only the extrinsic test — an objective comparison limited to protectable elements — governs; the subjective intrinsic test is reserved for the trier of fact. The trade dress claim fared differently and was dismissed for failure to articulate a discrete, concrete list of the elements composing the claimed dress.

Open questions

How thin is “thin”? The opinion endorses protection for Tangle’s arrangement but defers the scope inquiry. On remand the district court must decide whether the constraints of the form yield robust protection or, as in Satava, only protection against virtually identical copying.
Where does function reenter? The rotating joints and tubular geometry are arguably utilitarian. The interplay with Star Athletica, L.L.C. v. Varsity Brands, Inc., 580 U.S. 405 (2017), and useful-article separability was not resolved and may resurface.
Will merger and scènes à faire defeat the claim later? Both doctrines survive as merits defenses; their force depends on a developed record about the universe of alternative expressions.
How far does kinetic fixation reach? The analogy to choreography and film invites questions about user-manipulable and generative works whose configurations are not authored in advance.

Implications

Pleading leverage shifts to plaintiffs. Idea-expression, merger, and scènes à faire are increasingly recognized as fact-intensive defenses ill-suited to Rule 12(b)(6); defendants should expect to litigate them at summary judgment.
Selection-and-arrangement is the workhorse theory. For works built from public-domain or functional components — compilations, designs, and now sculptures — the Feist/Satava combination doctrine is the most durable route to protection.
Scope, not validity, is the real battleground. A finding that an arrangement is protectable says little about how much copying is actionable; “thin” copyright remains a powerful limiting principle.
Kinetic and interactive works gain footing. The fixation holding supplies authority for protecting movable art and, by analogy, configurable digital and physical objects.
Drafting discipline pays off. Tangle’s copyright claim survived where its trade dress claim failed for want of a concrete element list — an enduring reminder that specificity in pleading the asserted work matters.

Frequently asked questions

Does Tangle hold that the sculptures are definitively protected? No. The court held only that Tangle plausibly alleged protectable expression and substantial similarity. Validity, scope, and infringement remain to be decided on a full record.

How does the case relate to the merger doctrine? Indirectly but importantly. The panel found the arrangement protectable precisely because the elements could be combined in many ways — the inverse of merger, which denies protection when an idea admits only one or a few expressions. Merger and scènes à faire remain available to the defendant on remand.

Why does fixation matter for a physical sculpture? Because the defendant argued that a work designed to assume ever-changing poses is not “fixed.” The court rejected that, holding that movable works are fixed if embodied in a perceivable material object, analogizing to choreography, film, and music.