That prints a complex maze, eh? So by complex, you mean unsolvable to seventeen sigmas of certainty.
I used to love screwing around in MS Paint. I would amaze my classmates by creating semitransparent objects using stippling, even though the displays were 800x600 and you'd have to be blind not to see the pixels. Yeah, Windows 95 was the best. This doesn't make what I did color interpolation, and it doesn't make that line print a maze.
And for the record, the equivalent C is [snip=c]for (;
printf((rand() & 1)? "╱" : "╲");[/snip], or if you really like, [snip=c]a: printf((rand() & 1)? "╱" : "╲"); goto a;[/snip].
The output looks like this:
An even more unicodey version is [snip=c]for (;
printf("%s", "┓\0┗\0┛\0┏\0┳\0┻\0┫\0┣\0╋" + ((rand() % 9) << 2));[/snip].
Its output instead looks like this:
tl;dr: Please let BASIC die in peace; programming hasn't gotten more difficult. For anything. It's only gotten easier; we just can't reserve non-ascii characters for box drawing anymore.