Well, maybe stair climber is more appropriate! Living in a condo, we have no stairs. The only object that resembles a stair or some apparatus Gilbert can scale is the foot stool for his rocking chair.
Yesterday morning I was playing with him when he did his usual stand up on it and then smoothly picked up his left leg and climbed the first step.
I immediately wondered how high he would go so I built a little make shift set up to test it out. On only his second attempt he got where he needed to be!