That area was painted with the landing pad as part of the 2005 refresh to try to disguise the fact is is just an open area. I don't know why anyone would put an actual helipad there as it isn't exactly convenient to reach in an emergency.
Interesting view from above, Poisoned. And yep, that area used to be open, and you could look down to the level below. I worked Space back in the early 80s and also Magic Journeys when it came over to Anaheim and showed on the Space Mountain stage. I liked it the way it was. Okay....there I go again....the way it was.... Sorry.
I think this idea/question is because of old memories. That are was once a stage. Space Stage. I can hardly remember it but found a good article about the area's progression. Tomorrowland Stage at Yesterland
I remember this stage, and I remember seeing a show there! (though I don't remember what the show was...)
I wish they'd just get rid of the theatre, already.
I always figured that the markings there were a tribute to the original pre 1967 Tomorrowland 'Flight Circle' which was located there. I can't figure how to insert links using my phone but you can find pics of the area over at Daveland.