Task: Question Answering
Input (English): Passage: In 1968, Pink Floyd returned to Abbey Road Studios to record their second album, A Saucerful of Secrets. The album included Barrett's final contribution to their discography, "Jugband Blues". Waters began to develop his own songwriting, contributing "Set the Controls for the Heart of the Sun", "Let There Be More Light" and "Corporal Clegg". Wright composed "See-Saw" and "Remember a Day". Norman Smith encouraged them to self-produce their music, and they recorded demos of new material at their houses. With Smith's instruction at Abbey Road, they learned how to use the recording studio to realise their artistic vision. However, Smith remained unconvinced by their music, and when Mason struggled to perform his drum part on "Remember a Day", Smith stepped in as his replacement. Wright recalled Smith's attitude about the sessions, "Norman gave up on the second album ... he was forever saying things like, 'You can't do twenty minutes of this ridiculous noise'". As neither Waters nor Mason could read music, to illustrate the structure of the album's title track, they invented their own system of notation. Gilmour later described their method as looking "like an architectural diagram".Released in June 1968, the album featured a psychedelic cover designed by Storm Thorgerson and Aubrey Powell of Hipgnosis. The first of several Pink Floyd album covers designed by Hipgnosis, it was the second time that EMI permitted one of their groups to contract designers for an album jacket. The release peaked at number 9, spending 11 weeks on the UK chart. Record Mirror gave the album an overall favourable review, but urged listeners to "forget it as background music to a party". John Peel described a live performance of the title track as "like a religious experience", while NME described the song as "long and boring ... [with] little to warrant its monotonous direction". On the day after the album's UK release, Pink Floyd performed at the first ever free concert in Hyde Park. In July 1968, they returned to the US for a second visit. Accompanied by the Soft Machine and the Who, it marked Pink Floyd's first significant tour. In December of that year, they released "Point Me at the Sky"; no more successful than the two singles they had released since "See Emily Play", it would be the band's last until their 1973 release, "Money". 
Question: What are the names of the two individuals whose method was later described as looking "like an architectural diagram"?
Output (English): Mason.