Getting around the first floor

FIRST FLOOR has something lying on its upper floor, but from the lift you can't get up there.
Nudge 1Where to look
Don't stay in FIRST FLOOR. Look next door.
Nudge 2A stronger push
From the lift's lower stop on FIRST FLOOR, walk left into MAKE UP. There's a gap in its floor that leads up.
Nudge 3Almost there
The upper floor of MAKE UP joins the upper floor of FIRST FLOOR.
What you needOther problems to solve first
Solve these first (each opens its own page, no answers on the way):
Show the solutionThe whole answer, with a video
Take the lift to FIRST FLOOR's lower stop, walk left into MAKE UP, climb through the gap in its floor to the upper level and walk right, back into FIRST FLOOR's upper floor. A pair of pom poms lies there: somebody on the Grease set will be very glad to see them (Sindy is crying in the malt shop). Later, MAKE UP's upper floor has something for another collection too.