All of the artwork for the Base Set cards was made by a group of only three illustrators: Sugimori, Arita, and Kinebuchi, with the exception of this card. However, the style of the artwork of this card strongly resembles Kinebuchi's. Therefore, this illustration does not stand out that much from the other ones in Base Set.
Conversion 1 is derived from Conversion, a move in the Pokémon games that Porygon can learn. Conversion 2 is a move later introduced in the Generation II Pokémon games that Porygon can learn. This card's English Pokédex entry comes from Pokémon Red and Blue, whereas the Japanese entry comes from Pokémon Red and Green.