The oldest surviving tarot cards are the 15 or so Visconti-Sforza tarot decks painted in the mid-15th century for the rulers of the Duchy of Milan. A lost tarot-like pack was commissioned by Duke Filippo Maria Visconti and described by Martiano da Tortona probably between 1418 and 1425, since the painter he mentions, Michelino da Besozzo, returned to Milan in 1418, while Martiano himself died in 1425. He described a 60-card deck with 16 cards having images of the Greek gods and suits depicting four kinds of birds. The 16 cards were regarded as "trumps" since in 1449 Jacopo Antonio Marcello recalled that the now deceased duke had invented a novum quoddam et exquisitum triumphorum genus, or "a new and exquisite kind of triumphs". Other early decks that also showcased classical motifs include the Sola-Busca and Boiardo-Viti decks of the 1490s.
The exposures of fraudulent activity led to a rapid decline in ectoplasm and materialization séances. Investigator Joe Nickell has written that modern self-proclaimed mediums like John Edward, Sylvia Browne, Rosemary Altea and James Van Praagh are avoiding the Victorian tradition of dark rooms, spirit handwriting and flying tambourines as these methods risk exposure. They instead use "mental mediumship" tactics like cold reading or gleaning information from sitters before hand (hot reading). Group readings also improve hits by making general statements with conviction, which will fit at least one person in the audience. Shows are carefully edited before airing to show only what appears to be hits and removing anything that does not reflect well on the medium.