[Newbies] Color definition problem with robots

[mechanic]

Hello, working through the 'Programming with Robots' book, the next annoyance
I've come to is on setting colors for objects/robots (p64 in the book). In
the following - simplified - example:

| pica |
pica := Bot new.
pica color: Color red.
 # all well so far
pica color: Color r:1 g:1 b:0 .

-this is as per the book but throws up a message 'MessageNotUnderstood:
Bot>>color:r:g:b'
Trying various syntax changes doesn't help. The text in the book reads: 
"For example, the expression Color r: 1 g: 0 b: 0 creates the same pure red
color that you get from Color red."
Maybe I'm missing something obvious, and I know I can use names for the
colo(u)rs, but it's annoying to hit a bump like this.
Any suggestions? 




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