"Today" gave "Blank Walls" 4/5, praising The Observatory for "uppthe ante by bringing in new drummer Adam Shah – who gives the band an unexpected edge – and crafting a beautiful opus that is hauntingly powerful." Complimenting The Observatory on how "the[ir audacity can be heard in the way sounds are spliced, unwound and transplanted without warning", Yeow Kai Chai of "The Straits Times" wrote, "No other Singapore band, past or present, has captured the imagination quite like The Observatory. In two brief years, this experimental space-rock combo has risen from nowhere to become a premier act which everybody talks about with a kind of reverential hush."