He found he was constantly out of money, so Selarón sold paintings to fund his work. It was long and exhausting work but he continued on and eventually covered the entire set of steps in tiles, ceramics and mirrors.
He found himself frequently without funds, so Selarón sold paintings to support his endeavors. It was a prolonged and fatiguing effort but he persisted and eventually covered the entire sequence of steps in tiles, ceramics, and mirrors.