It was pen actually. Luckily it's scotchguarded though and come off with no trouble. But he's defintely into drawing big time, not so much a few months ago but you cannot leave pens lying around, he will get them and find something to draw on. Actually he drew on the lounge accidentally, he was trying to draw on an envelope and watch t.v at the same time, small envelopes, t.v, pens, an almost 18 month old and an envelope don't mix very well.