Only a half an hour before I came across this astonishing article from the Houston Chronicle Magazine I was standing nearly on top of the spot where the “unimpressive, austere, green frame building behind the Rice Physics Building” once sat.
There were at least two buildings here over the years. This one was built very early on for H.A. Wilson to do his nuclear work:
And here’s a tiny peek at a later structure, circa 1970s: