You have to unfocus your eyes and just wait. That's all I can say to describe the process of seeing it.
Where were you in the 90s though? 
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I am honestly 80% certain these have no 3D element to them and I have been tricked into staring at them but not quite a them but behind them even though they’re on 2D paper and crossing my eyes and slowly uncrossing and someone out there finds this hilariouspic.twitter.com/P9PQIyNlu9
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This is how I feel about wine tasting notes
#PersonalConspiracyTheory
End of conversation
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(actually it *would* be quite interesting)