Arthur F. G. Carter

Imagine this: A spectator shuffles a regular blue-backed deck and freely selects any card - no forcing, no restrictions. That card is immediately sealed inside an envelope, in full view. On the table, untouched from the beginning, lies a wallet - secured by elastic bands. Inside, the spectator discovers another sealed envelope. The envelope in the wallet is opened and a red-backed card is extracted. The spectator's blue-backed card is taken out from the envelope, two different cards from two different places. No envelope switch (only two envelopes used). No sleights. No clue. Yet when both...