Consideration of the formal semantics of APL particularised to consideration of the unusual properties of the null expression. It was something of a surprise to discover that these properties had already been fully documented 100 years ago by Lewis Carroll (Cal). Since that opus is not normally a part of the lore of APL, this paper attempts to re-interpret the original findings in 20th century terminology. APL has a number of objects which are, in some sense, null or empty - two empty vectors, multitudinous other empty arrays, undefined objects and local variables with names but no values. There is at least one other null entity. It has no name, and it has no value. Worse yet, it is denoted by the empty string, and is therefore not easily seen.