<Tr> <Th> ōban (大判) </Th> <Td> large </Td> <Td> 38 × 25.5 (15.0 × 10.0) </Td> <Td> </Td> </Tr> <Tr> <Td> 58 × 32 (23 × 13) </Td> <Td> </Td> </Tr> <Tr> <Th> ō - tanzaku (大 短冊 判) </Th> <Td> large poem card </Td> <Td> 38 × 17 (15.0 × 6.7) </Td> <Td> </Td> </Tr> <Tr> <Th> chū - tanzaku (中 短冊 判) </Th> <Td> medium poem card </Td> <Td> 38 × 13 (15.0 × 5.1) </Td> <Td> </Td> </Tr>

What prompted the development of woodblock printing in japan