Photo of a Bird cage in the form of a circus wagon, Painted metal wire, sheet metal, In the shape of a circus wagon, on four wheels with axles; central portion of roof arched, door and handle on each side of arch, shallow crown-like decoration and handle at top of arch; doors on long sides of cage; pull-out pan with handle on bottom of cage; decorated with looped, braided and coiled wire and tiny metal leaves.

The metal frame of a birdcage inspired architect William Le Baron Jenney to use a similar framework when designing the first modern skyscraper (Artokoloro/Alamy Stock Photo)

Artokoloro/Alamy Stock Photo