Virtual Worlds visited so far:

Second Life

Openlifegrid

Entropia Universe

Anarchy Online

Imvu

Lively

Apart from MMORPG:

Homeworld (1+2)

Freelancer

X2

so.. what virtual realities?

uhhhhhhm.....

a lot comes to my mind.. i do actually know a lot of things besides what maybe considered as common reality.

to just name some:

• Music
• Books
• Games (like... any, no matter if its childsplay or a serious multimillion $ thingie, it involvevs your imagination, or it doesn´t work for you)
• Dreams, especially daydreams, wich are the ones you are most aware of
• other peoples minds
• politicians, wich do not fall under common other people, but surely are a virtual reality on their own

the three boys in the sandbox, each having a red, like daddy said, bucket, shovel or model-car, meaning each having his own red in mind, wich means nothing but three virtual worlds colliding in the end. ;)