Incubator Trick. German, ca. 1930s [likely refinished later]. The magician shows the colorful canister empty and then produces two large brass birdcages from inside or, alternatively, transforms colored balls (or any other item placed in its interior) into the cages. Unusual external sliding sleeve aids in the deceptiveness of the trick. Cages very well made. Includes 15 colorful, spring balls. Canister measures 13 ?? tall.