Ah!  Check out this old map of the Ontario Science Centre.  I remember it well!  Many great memories of visiting and all the exhibits within… Lasers!  The giant And/Or logic circuit gate ball drop!  The miniature lift locks!  Shadow freezing!  Parabolic disk whispering!  And one of my ever-favs, this amazing 2-story contraption that required four people on bicycles to pump water to the top through a series of pipes that could then be released down more transparent pipes to run turbines that would power lights, fans, and a model train.  Great stuff, and a great axonometric map that shows it all.

Hilarious story:  In earlier versions, the map didn’t include the word “Exploring” before the word “Space”, and so for many years I never visited that tower, as my young mind translated that to “Empty Space”, like it must be some sort of strange store room ready for future expansion or something…  ah, silly me.  Especially given how much I loves me my space program and the wonders of outer space!

Bonus postscript:  The OSC building itself is quite nifty, a brutalist gem nestled within a lush forest heading down a steep incline.  The double bridge leading from the reception building to the tower building was amazingly serene and a nice transition from the everyday world behind that built excitement.  Traveling down the massive escalators to the valley building meant passing seemingly hundreds of trees.  The grand hall was indeed grand, and the towers suitably impressive areas for exhibits.  The mezzanines looking down on exhibits below let the eyes wander from wonder to wonder.  Visiting the building was as exciting for me as was what was in it.