The List reporter block will normally return a string containing the items in the list, separated by space characters. Unless ALL the items in the list are single characters, in which case it will omit the space separators. This can be handy. Update 22 January 2021: @colinmacc found that if even one of the items in a list of single character items are added as a number (for instance, using the random block), the List reporter block will return a space delimited string. https://scratch.mit.edu/projects/400699258/