For some of that period, they were living in Mike Leonard's house. Leonard was a lecturer at Hornsey Art College, specializing in light shows. To some extent, Pink Floyd's early career was an offshoot of his need for a musical component to his multimedia shows. Here's a (sadly monochrome) indication of the sort of thing they got up to:

https://www.youtube.com/watch?v=LUjrxxYBsi4&t=278s